Searching for new physics in proton-proton collisions at the LHC | --> Searching for new physics in ultra-rare kaon decays | --> Searching for new physics in rare B decays | --> Deep-underground neutrino experiment | --> Calorimetry research and development for a future e+e- collider | --> Proton structure and QCD in deep inelastic electron proton scattering | --> Colliding heavy ions at the LHC to investigate the quark-gluon plasma |
Accelerator research and development for a future e+e- collider |
About the university, research at cambridge.
Postgraduate Study
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The PhD in Physics is a full-time period of research which introduces or builds upon, research skills and specialist knowledge. Students are assigned a research supervisor, a specialist in part or all of the student's chosen research field, and join a research group which might vary in size between a handful to many tens of individuals.
Although the supervisor is responsible for the progress of a student's research programme, the extent to which a postgraduate student is assisted by the supervisor or by other members of the group depends almost entirely on the structure and character of the group concerned. The research field is normally determined at entry, after consideration of the student's interests and the facilities available. The student, however, may work within a given field for a period of time before their personal topic is determined.
There is no requirement made by the University for postgraduate students to attend formal courses or lectures for the PhD. Postgraduate work is largely a matter of independent research and successful postgraduates require a high degree of self-motivation. Nevertheless, lectures and classes may be arranged, and students are expected to attend both seminars (delivered regularly by members of the University and by visiting scholars and industrialists) and external conferences. Postgraduate students are also expected to participate in the undergraduate teaching programme at some time whilst they are based at the Cavendish, in order to develop their teaching, demonstrating, outreach, organisational and person-management skills.
It is expected that postgraduate students will also take advantage of the multiple opportunities available for transferable skills training within the University during their period of research.
By the end of the research programme, students will have demonstrated:
The Postgraduate Virtual Open Day usually takes place at the end of October. It’s a great opportunity to ask questions to admissions staff and academics, explore the Colleges virtually, and to find out more about courses, the application process and funding opportunities. Visit the Postgraduate Open Day page for more details.
See further the Postgraduate Admissions Events pages for other events relating to Postgraduate study, including study fairs, visits and international events.
3-4 years full-time, 4-7 years part-time, study mode : research, doctor of philosophy, department of physics, course - related enquiries, application - related enquiries, course on department website, dates and deadlines:, lent 2024 (closed).
Some courses can close early. See the Deadlines page for guidance on when to apply.
Michaelmas 2024 (closed), easter 2025, funding deadlines.
These deadlines apply to applications for courses starting in Michaelmas 2024, Lent 2025 and Easter 2025.
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The activities of the doctoral programme are concentrated at the Division of Particle Physics and Astrophysics within the department of Physics. Students carry out their research projects in the Department of Physics and many other institutes, e.g. Helsinki Insitute of Physics, the Finnish Meteorological Institute and the Finnish Geodetic Institute.
Want to know more? Visit our profile & activities page to learn more about the programme.
About particle physics theory.
The research group in Particle Physics Theory at the University of Edinburgh is one of the largest in the UK. We have a large group of PhD students from around the world: recent examples include students from Ireland, Germany, Italy, the United States, as well as the UK. We are always interested in good students who would like to join us and begin studying for a PhD.
PhD students in the Particle Physics Theory group may choose to explore all the group's research interests in their first few months. After this time, they begin work on a research project which is mutually agreed with a staff member. So, broadly speaking, we offer PhD projects in all of our areas of research interest:
We also have more specific PhD projects which you can explore below.
A list of current PhD projects in Particle Physics Theory is shown below. Click on each project to find out more about the project, its supervisor(s) and its research area(s).
Particle physics, experimental.
The experimental High Energy Physics group is active in a range of experiments studying the fundamental constituents of matter. The work includes accelerator-based experiments, studies using nuclear reactors, and the detection of new particles from astrophysical sources. This research takes place within the Enrico Fermi Institute and in many cases is joint with faculty in other departments. Faculty also work in close collaboration with researchers at CERN , the Fermi National Accelerator Laboratory and Argonne National Laboratory . The University of Chicago manages the latter two laboratories for the Department of Energy. Current research in high-energy physics includes studies of p-p interactions using the LHC at CERN; searches for weakly interacting and/or long-lived particles at dedicated experiments near accelerators like the LHC; development of new technologies, sensor concepts, collider facilities, and accelerator concepts for future high-energy experiments; searches for supersymmetric particles, dark sectors, and other unobserved forms of matter; precision tests of electroweak theory through measurements of the properties of the top quark and the W and Z bosons; searches for dark matter, both in collider experiments and from astrophysical sources; study of neutrino oscillations; studies of the highest energy cosmic rays; high-precision measurement of CP violation in K decays and high-sensitivity search for rare K decays. - View the experimental particle physics faculty .
The Particle Theory Group, part of the Enrico Fermi Institute and associated with the Kadanoff Center for Theoretical Physics, and the Kavli Institute for Cosmological Physics carries out research on a wide range of theoretical topics in formal and phenomenological particle physics, including field theory, string theory, supersymmetry, the standard model and beyond, cosmology, and mathematical physics. Among the many research topics are string theory and unification, duality in gauge theory and string theory, solitons and topological structures, D-branes, non-commutative geometry, the AdS/CFT correspondence, inflationary cosmology, the cosmological constant problem, CP violation, B physics, baryogenesis, supersymmetric model building, precision electroweak measurements, low-energy supersymmetry, heavy quark physics, confinement in QCD, quantum theory of black holes, large extra dimensions, fermion mass hierarchy, and integrable systems. There are strong ties to the Fermilab Theoretical Physics Group , the Argonne Theoretical High Energy Group , and the High Energy Experiment group at Chicago . Detailed information about the Particle Theory Group can be found here . - View the theoretical particle physics faculty .
Edward blucher.
Professor. Co-Spokesperson, DUNE Collaboration; Director, Enrico Fermi Institute.
For more information about Professor Blucher, please visit his webpage .
Professor; experimental astrophysics.
For more information about Professor Collar, please visit his webpage .
For more information about Professor DeMille, please visit his webpage .
Assistant Professor
For more information about Professor DiPetrillo, please visit her webpage .
Professor; Deputy Director and Chief Research Officer, Fermilab
For more information about Professor Fleming, please visit her webpage .
For more information about Professor Frisch, please visit his webpage .
Associate Professor.
For more information about Professor Grandi, please visit his webpage .
Professor; APS President-Elect.
For more information about Professor Kim, please visit her webpage .
For more information about Professor Miller, please visit his webpage .
For more information about Professor Oreglia, please visit his webpage .
Professor Emeritus.
For more information about Professor Pilcher, please visit his webpage .
For more information about Professor Privitera, please visit his webpage .
For more information about Professor Schmitz, please visit his webpage .
For more information about Professor Shochet, please visit his webpage .
For more information about Professor Wah, please visit his webpage .
Marcela carena.
Professor (Part-time); Head of the Theory Division, Fermilab.
For more information about Professor Carena, please visit her webpage .
Assistant Professor.
For more information about Professor Córdova, please visit his webpage .
For more information about Professor Delacrétaz, please visit his webpage .
For more information about Professor Harigaya, please visit his webpage .
For more information about Professor Harvey, please visit his webpage .
For more information about Professor Kutasov, please visit his webpage .
For more information about Professor Martinec, please visit his webpage .
Professor Emeritus
For more information about Professor Rosner, please visit his webpage .
For more information about Professor Sethi, please visit his webpage .
University Professor.
For more information about Professor Son, please visit his webpage .
Professor (Half-time); Head High-Energy Physics Theory Group, Argonne National Lab.
For more information about Professor Wagner, please visit his webpage .
For more information about Professor Wang, please visit his webpage .
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Enhancing superconducting properties of srf thin films by laser processing, phd research project.
PhD Research Projects are advertised opportunities to examine a pre-defined topic or answer a stated research question. Some projects may also provide scope for you to propose your own ideas and approaches.
This project is in competition for funding with other projects. Usually the project which receives the best applicant will be successful. Unsuccessful projects may still go ahead as self-funded opportunities. Applications for the project are welcome from all suitably qualified candidates, but potential funding may be restricted to a limited set of nationalities. You should check the project and department details for more information.
Funded phd project (uk students only).
This research project has funding attached. It is only available to UK citizens or those who have been resident in the UK for a period of 3 years or more. Some projects, which are funded by charities or by the universities themselves may have more stringent restrictions.
Fully-funded phd in sustainable high power rf amplifiers for muon colliders, top quark physics beyond the standard model at the atlas detector, competition funded phd project (uk students only).
This research project is one of a number of projects at this institution. It is in competition for funding with one or more of these projects. Usually the project which receives the best applicant will be awarded the funding. The funding is only available to UK citizens or those who have been resident in the UK for a period of 3 years or more. Some projects, which are funded by charities or by the universities themselves may have more stringent restrictions.
Studying strong interaction with polarised probes, awaiting funding decision/possible external funding.
This supervisor does not yet know if funding is available for this project, or they intend to apply for external funding once a suitable candidate is selected. Applications are welcome - please see project details for further information.
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Is becoming a particle physicist right for me.
The first step to choosing a career is to make sure you are actually willing to commit to pursuing the career. You don’t want to waste your time doing something you don’t want to do. If you’re new here, you should read about:
Still unsure if becoming a particle physicist is the right career path? Take the free CareerExplorer career test to find out if this career is right for you. Perhaps you are well-suited to become a particle physicist or another similar career!
Described by our users as being “shockingly accurate”, you might discover careers you haven’t thought of before.
If you're interested in pursuing a career in particle physics, here are the steps you can take:
Internships Internships are a great way for particle physicists to gain hands-on experience in their field and to develop their skills in a practical setting. Some potential options for internships for particle physicists could include:
Organizations and Associations There are several professional organizations and associations for particle physicists that can provide valuable resources, networking opportunities, and career support. Here are some examples:
Applications for Particle Physics PhD projects within our group are open all-year round, however funded PhD projects normally start in October with the applications being reviewed and invitations sent out for interviews in January-March.
The STFC/UKRI funding body which provides the funding for most Particle Physics PhD studentships around the country does not require offer holders to make the final decision until April such that there will be a waiting list for candidates until April/Mai. Applications can be submitted here .
Generally, the candidates should have a good knowledge of particle physics and programming skills. Knowledge of particle astrophysics and nuclear physics is desirable for some of the projects. Travel to and extended stays at the experimental sites are expected for a number of projects (Japan, CERN/Switzerland, USA). The projects are open to home and international candidates but international students may need to secure funding to pay fees and living expenses.
It is sufficient to apply to one of the projects to be considered for all, but please state clearly your priorities and interests. Each year a number of funded places is available which are allocated according to the priorities of the group and the quality of the candidates.
Below, short descriptions of generally available projects can be found with longer versions and links to recent projects available here .
- Prof E Daw
This Ph.D. project involves searches for hidden sector dark matter, including QCD axions and axion like particles (ALPs). Our group at Sheffield leads the 'Quantum Sensors for the Hidden Sector' collaboration, and collaborates with the Axion Dark Matter Experiment (ADMX) collaboration in the USA. A Ph.D. in this area would involve elements of detector simulation, lab based characterisation of detectors and detector parts, instrumentation design and operation, characterisation of microwave electronics both at cryogenic temperatures (to 10mK) and at room temperature, and data analysis.
- Prof Vitaly Kudryavtsev, Prof D R Tovey
LUX-ZEPLIN (LZ) is a high-sensitivity dark matter experiment currently operating in the deep underground laboratory at SURF (South Dakota, USA). LZ is sensitive to dark matter particles (WIMPs) predicted by many leading theories beyond the Standard Model of particle physics, such as supersymmetry. The particle physics and particle astrophysics (PPPA) group at the University of Sheffield has been involved in the LZ experiment since the very beginning of its design and construction with a prime responsibility of developing software for modelling and data analysis, simulations, understanding background radiation, and analysis of experimental data. The project will involve the analysis of data from the LZ experiment and may focus on various physics topics including background model and identification of possible signal.
- Prof Vitaly Kudryavtsev
DUNE is a large international project to design, construct and operate a multi-kilotonne scale liquid argon detector for neutrino physics, neutrino astrophysics and a search for physics phenomena beyond the Standard Model. This PhD project will focus on development of a methodology for DUNE detector calibration, in particular using atmospheric muons. It may also include development of analysis based on machine learning techniques to search for nucleon decay events and separate them from a much larger background from cosmic-ray muons and atmospheric neutrinos. Participation in the SBND (Short-Baseline Near Detector) experiment at Fermilab is possible via detector operation shifts and data analysis.
- Dr S Cartwright, Dr M Malek
The particle physics and particle astrophysics (PPPA) group at the University of Sheffield has a long-standing involvement in Japan’s long-baseline neutrino programme. Sheffield PhD students working on the Japanese long-baseline programme typically work on T2K, which gives them the opportunity to analyse data from a currently operating long-baseline neutrino experiment. However there is also the option of involvement with either the Super-K or Hyper-K experiments (in addition to T2K).
- Dr T Vickey
It's possible that the 125 GeV Higgs boson is only one of several neutrally-charged Higgs bosons predicted by theories beyond the Standard Model. Many of these theories predict the existence of a more massive Higgs boson that is able to decay into two lighter 125 GeV Higgses. The student will develop analysis strategies to search for the production of two neutral 125 GeV Higgs bosons at ATLAS. Searches will focus on a final state where one of the Higgs bosons decays into two tau leptons, and the second Higgs boson decays to a pair of bottom quarks. The student will participate in developing algorithms for tau lepton identification, and will also have the opportunity to assist with silicon module construction for the ATLAS tracker upgrade.
- Dr K Lohwasser, Dr C Anastopoulos
A position is open for an enthusiastic PhD student to conduct research at the energy frontier at the ATLAS experiment. The main topic is to investigate further the nature of electroweak symmetry breaking and to search for new physics phenomena using Higgs and diboson measurements. The PhD project will involve heavily data analysis, statistics, advanced analytical classification methods and possibly machine learning. The PhD will prepare equally well for a career in industry and academia.
- Prof D Costanzo, Prof D Tovey
The student will work on the analysis of the data collected by the ATLAS experiment at the Large Hadron Collider to search for new particles that are postulated by Supersymmetry. The student will be focusing on searches where particles decay into heavy-flavour quarks with a large missing transverse energy also observed. The work is done in collaboration with an international team and the student will also be expected to participate in the ATLAS experimental work.
- Dr T Vickey, Dr K Lohwasser
A position is open for an enthusiastic PhD student to conduct research in developing silicon sensor technologies in use at the energy frontier at the ATLAS experiment. This project will focus on the construction of detector modules for the new all-silicon Inner Tracking detector (ITk), part of which is being built in the University of Sheffield Semiconductor Detector Development Facility. The PhD project will involve practical work in the lab but also the interpretation of results and design of new experiments.
Cosmic-ray muons are known to be useful in applications beyond particle astrophysics. They have helped with mapping structure of volcanoes and with finding voids in various geological structures. Other possible applications include studies of geological repositories including monitoring carbon capture and tracing illicit nuclear materials. This computational PhD project offers an opportunity for a student to apply the knowledge of particle and astroparticle physics, and detector technology in areas which are linked to key issues of the contemporary world: climate change, nuclear security etc. One particular application of cosmic-ray muons to be addressed in this project is the identification of materials in cargo.
We have been rated 1st in the UK in terms of the quality of our research. In the latest REF, 100 per cent of research and impact from our department has been classed as world-leading or internationally excellent.
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All about particle physics.
I am currently doing my PhD in particle physics (BSM phenomenology), now 7 months into it. I need some advice about the value of doing this PhD for future jobs, as I am doubting it is the right choice for my career.
I am very sure I won't stay in academia if I finish my PhD, and so I would go into industry jobs. My current concern is that such a PhD won't be valued in industry. If I wish to go work in tech companies, renewable energies, data science, etc, how useful is it for me to complete my PhD in particle physics? Is it better to just go right into industry and get experience in those areas? I like the PhD itself and the research I am doing, but I am very worried about my future and that this PhD won't be useful and won't be valued, and that other people with a more industry oriented studies will be more competent than me for the job. I would love to hear your experiences if you went to industry after your PhD! Was it worth the PhD? Did they value you for having it? Did you get a certain job because you have a PhD in particle physics? Thanks in advance.
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The Chinese-American particle physicist Tsung-Dao Lee died on 4 August at the age of 97. Lee shared half of the 1957 Nobel Prize for Physics with Chen Ning Yang for their theoretical work that overturned the notion that parity is conserved in the weak force – one of the four fundamental forces of nature. Known as “parity violation”, it was was proved experimentally by, among others, Chien-Shiung Wu .
Born on on 24 November 1926 in Shanghai, Lee began studying physics in 1943 at the National Chekiang University (now known as Zhejiang University) and, later, at National Southwest Associated University in Kunming. In 1946 Lee moved to the US to the Univeristy of Chicago on a Chinese government fellowship, doing a PhD under the guidance of Enrico Fermi, which he completed in 1950.
After his PhD, Lee worked at Yerkes Astronomical Observatory in Wisconsin, the University of California at Berkeley and the Institute for Advanced Study at Princeton before moving to Columbia University in 1953. Three years later, he became the youngest-ever full professor at Columbia, remaining at the university until retiring in 2012.
It was at Columbia where Lee did his Nobel-prize-winning work on parity, which is a property of elementary particles that expresses their behaviour upon reflection in a mirror. If the parity of a particle does not change during reflection, parity is said to be conserved. But since the early 1950s, physicists had been puzzled by the decays of two subatomic particles, known as tau and theta.
These particles, also known as K-mesons, are identical except that the tau decays into three pions with a net parity of -1, while a theta particle decays into two pions with a net parity of +1. This puzzling observation meant that either the tau and theta are different particles or – controversially – that parity in the weak interaction is not conserved, with Lee and Yang proposing various ways to test their ideas ( Phys. Rev. 104 254) .
Wu, who was also working at Columbia, then suggested an experiment based on the radioactive decay of unstable cobalt-60 nuclei into nickel-60. In what became known as the “Wu experiment”, she and colleagues from the National Bureau of Standards used a magnetic field to align the cobalt nuclei with their spins parallel, before counting the number of electrons emitted in both an upward and downward direction.
Wu and her team found that far more electrons were being emitted downwards then upwards, which for parity to be conserved would be the same for both the normal state and in the mirror image. Yet when the field was reversed, as it would be in the mirror image, they found that more electrons were detected upwards, proving that parity is violated in the weak interaction.
For their work, Lee and Ning Yang shared the 1957 Nobel Prize for Physics. Then just 30, Lee was the second youngest Nobel-prize winning scientist after Lawrence Bragg , who was 25 when he shared the 1915 Nobel Prize for Physics with his father, William Henry Bragg. It has been argued that Wu should have shared the prize too for her experimental evidence of parity violation, although the story is complicated because two other groups were also working on similar experiments at the same time.
Lee went on to publish several books including Particle Physics and Introduction to Field Theory in 1981 and Science and Art in 2000. As well as the Nobel prize, he was also awarded the Albert Einstein Award in 1957 and the Matteucci Medal in 1995.
At a reception in 2011 to mark Lee’s retirement , William Zajc, chair of Columbia’s physics department, noted that it was “impossible to overstate [Lee’s] influence on the department of physics, on Columbia and on the entire field of physics.”
Lee, on the other hand, noted that retirement is “like gardening”. “You may not be cultivating a new species, but you can still keep the old beautiful thing going on,” he added.
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This groundbreaking research demonstrates a potential for quantum networks based on cold-atom integrated nanophotonic circuits.
Researchers at Purdue University have trapped alkali atoms (cesium) on an integrated photonic circuit, which behaves like a transistor for photons (the smallest energy unit of light) similar to electronic transistors. These trapped atoms demonstrate the potential to build a quantum network based on cold-atom integrated nanophotonic circuits. The team, led by Chen-Lung Hung , associate professor of physics and astronomy at the Purdue University College of Science, published their discovery in the American Physical Society’s Physical Review X.
“We developed a technique to use lasers to cool and tightly trap atoms on an integrated nanophotonic circuit, where light propagates in a small photonic ‘wire’ or, more precisely, a waveguide that is more than 200 times thinner than a human hair,” explains Hung, who is also a member of the Purdue Quantum Science and Engineering Institute . “These atoms are ‘frozen’ to negative 459.67 degrees Fahrenheit or merely 0.00002 degrees above the absolute zero temperature and are essentially standing still. At this cold temperature, the atoms can be captured by a ‘tractor beam’ aimed at the photonic waveguide and are placed over it at a distance much shorter than the wavelength of light, around 300 nanometers or roughly the size of a virus. At this distance, the atoms can very efficiently interact with photons confined in the photonic waveguide. Using state-of-the-art nanofabrication instruments in the Birck Nanotechnology Center, we pattern the photonic waveguide in a circular shape at a diameter of around 30 microns (three times smaller than a human hair) to form a so-called microring resonator. Light would circulate within the microring resonator and interact with the trapped atoms.”
A key aspect function the team demonstrates in this research is that this atom-coupled microring resonator serves like a ‘transistor’ for photons. They can use these trapped atoms to gate the flow of light through the circuit. If the atoms are in the correct state, photons can transmit through the circuit. Photons are entirely blocked if the atoms are in another state. The stronger the atoms interact with the photons, the more efficient this gate is.
“We have trapped up to 70 atoms that could collectively couple to photons and gate their transmission on an integrated photonic chip. This has not been realized before,” says Xinchao Zhou, graduate student at Purdue Physics and Astronomy. Zhou is also the recipient of this year’s Bilsand Dissertation Fellowship .
The entire research team is based out of Purdue University in West Lafayette, Indiana. Hung served as principal investigator and supervised the project. Zhou performed the experiment to trap atoms on the integrated circuit, which was designed and fabricated in-house by Tzu-Han Chang, a former postdoc now working with Prof. Sunil Bhave at the Birck Nanotechnology Center . The critical portions of the experiment were set up by Zhou and Hikaru Tamura, a former postdoc at Purdue at the time of the research and now an assistant professor at the Institute of Molecular Science in Japan.
“Our technique, which we detailed in the paper, allows us to very efficiently laser cool many atoms on an integrated photonic circuit. Once many atoms are trapped, they can collectively interact with light propagating on the photonic waveguide,” says Zhou. “This is unique for our system because all the atoms are the same and indistinguishable, so they could couple to light in the same way and build up phase coherence, allowing atoms to interact with light collectively with stronger strength. Just imagine a boat moving faster when all rowers row the boat in synchronization compared with unsynchronized motion. In contrast, solid-state emitters embedded in a photonic circuit are hardly ‘the same’ due to slightly different surroundings influencing each emitter. It is much harder for many solid-state emitters to build up phase coherence and collectively interact with photons like cold atoms. We could use cold atoms trapped on the circuit to study new collective effects,” says Hung.
The platform demonstrated in this research could provide a photonic link for future distributed quantum computing based on neutral atoms. It could also serve as a new experimental platform for studying collective light-matter interactions and for synthesizing quantum degenerate trapped gases or ultracold molecules.
“Unlike electronic transistors used in daily life, our atom-coupled integrated photonic circuit obeys the principles of quantum superposition,” explains Hung. “This allows us to manipulate and store quantum information in trapped atoms, which are quantum bits known as qubits. Our circuit may also efficiently transfer stored quantum information into photons that could ‘fly’ through the photonic wire and a fiber network to communicate with other atom-coupled integrated circuits or atom-photon interfaces. Our research demonstrates a potential to build a quantum network based on cold-atom integrated nanophotonic circuits.”
The team has been working on this research area for several years and plans to pursue it with vigor. Their past research discovery tied to this work include recent breakthroughs such as the realization of the ‘tractor beam’ method in 2023 listing Zhou as first author, and the realization of highly efficient optical fiber-coupling to a photonic chip in 2022 with a pending US patent application. New research directions have opened up due to the team’s successful demonstration of atoms being very efficiently cooled and trapped on a circuit. The future for this research is bright with many avenues to explore.
“There are several promising next steps to explore,” says Hung. “We could arrange the trapped atoms in an organized array along the photonic waveguide. These atoms can collectively couple to the waveguide through constructive interference but cannot radiate photons into the surrounding free space due to destructive interference. We aim to build the first nanophotonic platform to realize the so-called ‘selective radiance’ proposed by theorists in recent years to improve the fidelity of photon storage in a quantum system. We could also try to form new states of quantum matter on an integrated photonic circuit to study few- and many-body physics with atom-photon interactions. We could cool the atoms closer to the absolute zero temperature to reach quantum degeneracy so that the trapped atoms could form a gas of strongly interacting Bose-Einstein condensate. We may also try synthesizing cold molecules from the trapped atoms with the enhanced radiative coupling from the microring resonator.”
This work was supported by the U.S. Air Force Office of Scientific Research (Grant No. FA9550-22-1-0031) and the National Science Foundation (Grant No. PHY-1848316 and ECCS-2134931). This work was published with support from the Purdue University Libraries Open Access Publishing Fund. Quantum science and engineering is one of four dimensions within Purdue Computes , a major initiative that enables the university to advance to the forefront with unparalled excellence at scale.
About the Department of Physics and Astronomy at Purdue University
Purdue’s Department of Physics and Astronomy has a rich and long history dating back to 1904. Our faculty and students are exploring nature at all length scales, from the subatomic to the macroscopic and everything in between. With an excellent and diverse community of faculty, postdocs and students who are pushing new scientific frontiers, we offer a dynamic learning environment, an inclusive research community and an engaging network of scholars.
Physics and Astronomy is one of the seven departments within the Purdue University College of Science. World-class research is performed in astrophysics, atomic and molecular optics, accelerator mass spectrometry, biophysics, condensed matter physics, quantum information science, and particle and nuclear physics. Our state-of-the-art facilities are in the Physics Building, but our researchers also engage in interdisciplinary work at Discovery Park District at Purdue, particularly the Birck Nanotechnology Center and the Bindley Bioscience Center. We also participate in global research including at the Large Hadron Collider at CERN, many national laboratories (such as Argonne National Laboratory, Brookhaven National Laboratory, Fermilab, Oak Ridge National Laboratory, the Stanford Linear Accelerator, etc.), the James Webb Space Telescope, and several observatories around the world.
About Purdue University
Purdue University is a public research institution demonstrating excellence at scale. Ranked among top 10 public universities and with two colleges in the top four in the United States, Purdue discovers and disseminates knowledge with a quality and at a scale second to none. More than 105,000 students study at Purdue across modalities and locations, including nearly 50,000 in person on the West Lafayette campus. Committed to affordability and accessibility, Purdue’s main campus has frozen tuition 13 years in a row. See how Purdue never stops in the persistent pursuit of the next giant leap — including its first comprehensive urban campus in Indianapolis, the Mitchell E. Daniels, Jr. School of Business, Purdue Computes and the One Health initiative — at https://www.purdue.edu/president/strategic-initiatives .
Contributors:
Chen-Lung Hung , associate professor of physics and astronomy at the Purdue University College of Science
Xinchao Zhou , graduate student at Purdue Physics and Astronomy
Written by Cheryl Pierce , Communications Specialist
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At 31, he and a colleague won the 1957 Nobel Prize in Physics for discovering that subatomic particles, contrary to what scientists thought, are not always symmetrical.
By Dylan Loeb McClain
Tsung-Dao Lee, a Chinese American physicist who shared the Nobel Prize in Physics in 1957 for overturning what had been considered a fundamental law of nature — that particles are always symmetrical — died on Sunday at his home in San Francisco. He was 97.
His death was announced in a joint statement by the Tsung-Dao Lee Institute at the Jiao Tong University in Shanghai and the China Center for Advanced Science and Technology in Beijing. Dr. Lee was a longtime professor at Columbia University.
The theory that Dr. Lee overturned was called the law of conservation of parity, which said that every phenomenon and its mirror image should behave precisely the same. At the time he challenged the theory, in 1956, it had been widely accepted for 30 years.
Dr. Lee was then a young professor at Columbia, where he had been promoted to full professor at age 29 — the youngest in the university’s history at that point.
He had become intrigued by a problem involving the decay of so-called K mesons, which are subatomic particles. These particles decay all the time, forming electrons, neutrinos and photons. Experiments had shown that when K mesons decayed, some exhibited changes that suggested that each differed from the others. But they also had identical masses and life expectancies, indicating that they were the same.
This apparent contradiction created quite a conundrum for physicists. They had assumed that weak nuclear forces, like meson decay, obeyed the law of conservation of parity just like the two other fundamental forces that govern quantum physics: strong nuclear forces, which bind protons and neutrons together in the nucleus, and electromagnetic forces, which govern the attraction and repulsion of electric charges and the behavior of light. In other words, scientists had assumed that the orientation of weak nuclear forces could always be reversed.
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Every now and then, Or Hen, who recently received tenure as an associate professor of physics at MIT, will refer back to a file that he has kept since middle school.
The file is a comprehensive assessment of Hen’s learning disabilities, stemming from dysgraphia — a neurological condition in which someone has difficulty translating their thoughts into written form. Hen was diagnosed with a severe case of dysgraphia as a kindergartener. In middle school, due to an administrative snafu, the school was unaware of his condition and, lacking proper support, Hen failed most of his classes. It wasn’t until one teacher took a special interest that Hen was sent for a detailed assessment of his learning abilities.
That assessment, which Hen did not read until later, when he was well into his undergraduate degree in physics, was for him a revelation and validation.
“I saw a lot of ‘he’s bad at this, and not good at that,’ and it went through all the things I failed at,” Hen recalls. “But there was one test where I did extremely well, and which they had bold-faced.”
It was a test of nonverbal thinking, or abstract comprehension, assessing Hen’s ability to conceptually pare down complex ideas to their fundamental core. In this test, Hen scored in the 99th percentile. Fittingly, by the time Hen read this, he was already immersed in studies of abstract concepts and systems in nuclear physics. On his own, he had gravitated to a field that suited his strengths. Reading the assessment gave him confidence in his own instincts.
“They wrote that ‘this skill is particularly strong in him, and you should push him toward areas that utilize it,’” Hen says.
He brings this up to students at MIT today, not to brag, but as a guide.
“I try to emphasize that there is more than one path to success,” Hen says. “Try to think about what you’re good at, and then do the hard work of finding out what area, group, subfield, can utilize that. Find the thing you bring that’s unique, and build on that. Because then you really shine.”
Today, Hen and his research group are probing the inner workings of the nucleus, the interactions between protons and neutrons, and their even smaller constituents of quarks and gluons, which are the basic ingredients that hold together all the visible matter in the universe. Hen seeks connections between how these particles behave and how their interactions shape the visible universe and extreme astrophysical phenomena such as neutron stars.
“A lot of physics, in my mind, is taking complex systems with lots of details and abstracting away the details to seek the main principles that drive everything,” he says.
A frontier of ideas
Hen grew up in the countryside of Jerusalem, Israel, as part of a moshav — a small Jewish village, where his family worked as farmers, raising chickens for their eggs. In kindergarten, once Hen was diagnosed with dysgraphia, his parents sought out any available resources to help him with his writing.
“I think my mother’s entire salary went toward corrective lessons,” Hen recalls.
In middle school, once the records of his condition were transferred to the school, and an assessment was made of his abilities, Hen was given permission to take his exams orally. Rather than writing his answers, he would sit with a teacher and talk it out. To this day, he credits his loquacious nature to those early, formative years.
“Everyone who knows me knows I talk a lot,” Hen says. “And part of that was the way I was able to learn by talking about the material.”
Once he could work around his dysgraphia, however, Hen soon became bored by the content of his lessons, and in high school, he routinely skipped class. A teacher, seeing his potential, told his parents about an outreach program at the nearby Hebrew University, which Hen’s teacher thought might challenge the boy in ways that high school could not.
In his last two years of high school, Hen took part in the program and enrolled in a couple university classes in programming, which he quickly took to. After graduation, he attended Hebrew University full-time, double-majoring in computer engineering and physics — a topic that he thought he might like, as his older brother had also majored in the topic.
One class, early on in his first year, was especially motivating. The class explored ideas in modern physics, and students got to hear from different physicists about the concepts and phenomena they were tackling in the moment.
“It showed us that the beginning of our studies may be hard and annoying, but this is what you’re working toward,” Hen says. “In that class, we learned about quantum mechanics and nonlinear solids and astrophysics, and it just gave us a view of the frontier of the field.”
At the core
After completing his undergraduate degrees, Hen joined the Israeli Defense Forces, which is a mandatory service for all Israeli citizens. He spent seven years in the army, working as a researcher in a physics laboratory.
In tandem with his military service, Hen was also pursuing a PhD in physics, and would make the short trip to Tel-Aviv University once a week and on weekends to work on his degree. There, he got to know an eccentric and beloved professor who took a chance on Hen and offered him a rare opportunity: to travel to the United States to help build a new particle detector. The detector would be based at Jefferson Laboratory, a facility funded by the U.S. Department of Energy that houses a huge particle accelerator, designed to collide beams of electrons with various atomic nuclei.
With a particle detector, physicists could essentially snap pictures of a collision and its aftermath, to tease out the subatomic constituents and their properties, and how they interact to make up an atom’s nuclear structure.
Hen spent a summer at the facility, helping to build a neutron detector that physicists hoped would shed light on “short-range correlations” — extremely brief, quantum-mechanical fluctuations that can occur between some protons and neutrons within an atom’s nucleus. When these particles get so close as to touch each other, their interactions become stronger, though only for a moment before they flit away. It’s thought that these short-range correlations are the source of most of the kinetic energy in a nucleus, which itself is the basis of all visible matter in the universe.
“More than half the kinetic energy in a nucleus comes from these weird states,” Hen says. “If you ever want to understand atomic nuclei and visible matter at its core, you have to also understand short-range correlations.”
Helping to build the neutron detector was a gratifying combination of hands-on work and abstract thinking, and from then on, Hen was hooked on experimental nuclear physics.
After completing his PhD, and a thesis on short-range correlations, Hen headed to MIT, where he interviewed for a postdoc position as a Pappalardo Fellow in the Laboratory of Nuclear Science. As he chatted with one person after another, he eventually found himself in the office of then-department head Peter Fisher, who encouraged Hen to also apply for an open faculty position.
A few months later, in 2015, he found himself in the fortunate position of starting at MIT as a postdoc, having already accepted a junior faculty position he would start at MIT 18 months later.
“MIT took a bet on me,” he says. “That’s the unique thing about MIT. They saw something in me that I didn’t see back then, and they supported me.”
Particle connections
In his first years on campus, Hen continued his work in short-range correlations. His group used data from particle accelerators around the world to develop a universal understanding of short-range correlations in a way that can be applied across many scales. It could, for instance, predict how the interactions would determine correlations in one type of atom versus another, and shape the behavior of much more dense and extreme phenomena such as neutron stars.
Hen also expanded into the field of neutrinos, which are nearly massless particles that are the most abundant particles in the universe. The properties of neutrinos are thought to be the key to the origins of matter, though neutrinos are notoriously difficult to study in detail because their detection requires detailed understanding of their interaction with atomic nuclei. Hen found that, instead of depending on the elusive interactions of neutrinos, there might be a way to abstract that behavior to that of a more detectable particle, to better understand the neutrino itself.
By analyzing data from electron-beam accelerators around the world, his group founded the “electrons-for-neutrinos” effort, which developed a framework that essentially transposed the interactions of an electron to describe how a neutrino would behave under similar circumstances — a tool that will help physicists interpret data from hard-to-pin-down neutrino experiments.
Reflecting on how he determines which direction to take his research, Hen says: “I have a big nose, and I like to talk to people and understand what they’re doing and whether can I do something there or not. I like to build communities, bring in people with different abilities, and do something big together, where the whole is greater than the sum of its parts.”
Big science
Hen got a chance to start up a big-science collaboration, as part of the Electron-Ion Collider (EIC), a concept for a particle accelerator that collides electrons with protons, neutrons, and nuclei to study the particles’ internal structures and how they are held together by the “strong nuclear force,” which is known as the strongest force in nature.
In late 2019, the EIC was a focus of a meeting at MIT, in which physicists from around the world gathered to discuss the project’s recent go-ahead, granted by the U.S. Department of Energy (DoE). The next step was to design a detector, and multiple versions were considered. Hen, who stopped in out of curiosity, wound up joining a community-wide effort to develop a menu of possible detectors that could be built at the EIC.
Hen then took a leadership role in the next step to put forward a specific detector design for the DoE to fund. Working closely with physicists Tanja Horn and John Lajoie, they called experts to join the effort, eventually gathering physicists from 98 institutions. Thanks to their collaborative efforts the DoE ultimately chose their design over a competing one. Hen and his colleagues subsequently reached out to that other group to join forces to further evolve and fine-tune the design.
“We combined strengths,” Hen says. “We are doing big science. And when you do big science, there’s lots of talented people involved. I’ve learned through this process that it’s all about how you interact with people and adapt yourself to do science, together.”
Today, Hen is overseeing aspects of the EIC’s science community that is leading its development, which is projected to break ground in the next few years. In the meantime, he continues to expand projects in his research group, and works to mentor his students and postdocs, just as he was supported through his early career.
“I’m a very fortunate person, in that I had so many mentors in my life, and they all believed in me and saw things I didn’t,” Hen says. “They noticed that I’m different in whichever capacity, and tried to squeeze that lemon. That was a big thing for me.”
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