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EducationUniversity of Groningen Summer SchoolsSearch for New Physics with Low-Energy Precision Tests


Rob Timmermans
Rob Timmermans

Rob Timmermans did his PhD research at the University of Nijmegen, after which he became a director-funded postdoctoral fellow at the Theoretical Division of Los Alamos National Laboratory. From 1998-2003 he was a fellow of the Royal Netherlands Academy of Arts and Sciences (KNAW) at the accelerator institute KVI. In 2003 he became full professor of theoretical physics at the University of Groningen. Since 2014 he is a member of the Van Swinderen Institute for Particle Physics and Gravity at the Faculty of Science and Engineering. From 2013-2016 he was the programme director for the bachelor and master programmes Physics and Applied Physics, and since 2016 he is the director of the Undergraduate School of Science & Engineering.

His research interests include theoretical particle physics, in particular low-energy tests in the context of the Standard Model effective field theory (parity, time-reversal, Lorentz & CPT symmetries, electric dipole moments, atomic parity violation, baryon number violation, neutron-antineutron oscillations) and theoretical hadronic physics, specifically the QCD few-body problem in the context of chiral effective field theory.

Selected Publications:

1. Noordmans, J., de Vries, J., & Timmermans, R. G. E. ,Tests of Lorentz and CPT symmetry with hadrons and nuclei. Physical Review C, 94(2) (2016).
2. Vos, K. K., Wilschut, H. W., & Timmermans, R. G. E. . Symmetry violations in nuclear and neutron beta decay. Reviews of Modern Physics, 87(4), 1483-1516 (2015)
3. Vos, K. K., Noordmans, J. P., Wilschut, H. W., & Timmermans, R. G. E., Exploration of Lorentz violation in neutral-kaon decay. Physics Letters B, 729, 112-116. (2014).

Mikhail Kozlov

Mikhail Kozlov received his PhD from Leningrad State University on the topic of "Parity nonconservation effects in mirror molecules". He received his Doctor of Science degree in 2002, on the topic of "Precision calculations of the parity non-conservation in atoms and tests of the standard model". He is a professor of St. Petersburg Electrotechnical University "LETI" and a member of Petersburg Nuclear Physics Institute and The Foundational Questions Institute (FQXi).

Mikhail’s research interests are atomic and molecular physics, low-energy tests of the standard model, and search for “new physics” beyond standard model. This includes development of new methods in atomic and molecular theory, parity nonconservation (PNC) in atoms and molecules, PNC and time-reversal violation and permanent electric dipole moments (EDMs) of atoms and molecules, space-time variation of fundamental constants, and quantum chaos.

Selected publications

1. M. S. Safronova, S. G. Porsev, M. G. Kozlov, J. Thielking, M. V. Okhapkin, P. Glowacki, D. M. Meier, and E. Peik "Nuclear charge radii of 229Th from isotope and isomer shifts", Phys. Rev. Lett. 121, 213001 (2018).
2. .F Ficek, P. Fadeev, V. V. Flambaum, D. F. Jackson Kimball, M. G. Kozlov, Y. V. Stadnik, D. Budker, "Constraints on exotic spin-dependent interactions between matter and antimatter from antiprotonic helium spectroscopy", Phys. Rev. Lett. 120, 183002 (2018).
3. M. G. Kozlov, V. A. Dzuba, and V. V. Flambaum "Hyperfine induced transitions 1S0 - 3D1 in Yb", Phys. Rev. A, 99, 012516 (2019)

Marianna Safronova

Marianna Safronova received her PhD from University of Notre Dame and she is presently a Professor at the University of Delaware. She is the recipient of numerous awards, including the Gordon Godfrey Fellowship, UNSW, Australia, University of Delaware College of Arts and Sciences Outstanding Scholar Award, Women Physicist of the Month Award (2012), Fellow of the American Physical Society (APS), and the 2000 SGI Award for Excellence in Computational Sciences and Visualization at the University of Notre Dame. Marianna is also active in various committees and boards; she is the Chair of the APS Division of Atomic, Molecular, and Optical Physics (DAMOP), a member of the Committee on a Decadal Assessment and Outlook Report on Atomic, Molecular, and Optical Science (AMO2020) of National Academy of Sciences, Engineering and Medicine, chair and organizer of the annual workshops of APS Group on Precision Measurement and Fundamental Symmetries (GPMFC), and a member of Scientific Advisory Board, JILA, University of Colorado and NIST, Boulder, USA.

Her research interests include the study of fundamental symmetries and search for physics beyond the standard model (BSM) of elementary particles and fundamental interactions, development of high-precision methodologies for calculating atomic properties and exploring their applications, atomic clocks, ultra-cold atoms and quantum information, long-range interactions, superheavy atoms, highly-charged ions, atomic anions, and other topics. She has contributed to a wide range of searches for BMS physics including the search for the variation of the fundamental constants, the search for the violation of Lorentz invariance, parity violation in atoms, and the search for the electron electric-dipole moment.

Selected Publications

1. “Search for new physics with atoms and molecules”, M. S. Safronova, D. Budker, D. DeMille, Derek F. Jackson-Kimball, A. Derevianko, and Charles W. Clark, Rev. Mod. Phys. 90, 025008 (2018).
2. “Two clock transitions in neutral Yb for the highest sensitivity to variations of the fine-structure constant”, M. S. Safronova, S. G. Porsev, Christian Sanner, and Jun Ye, Phys. Rev. Lett. 120, 173001 (2018)
3. “Highly charged ions: optical clocks and applications in fundamental physics”, M. G. Kozlov, M. S. Safronova, J. R. Crespo López-Urrutia, P. O. Schmidt, Rev. Mod. Phys. 90, 45005 (2018)

Mike Tarbutt
Mike Tarbutt

Prof. Mike Tarbutt received his PhD from the University of Oxford where he worked on the spectroscopy of highly charged ions. He was a postdoctoral researcher at the University of Sussex, and then moved to Imperial College London. He is an expert on cooling molecules to low temperatures and using them for applications in quantum science and tests of fundamental physics.

Selected publications

1. “Magnetic trapping and coherent control of laser-cooled molecules”, H. J. Williams, L. Caldwell, N. J. Fitch, S. Truppe, J. Rodewald, E. A. Hinds, B. E. Sauer and M. R. Tarbutt, Phys. Rev. Lett. 120, 163201 (2018).
2. “Ultracold molecules for measuring the electron's electric dipole moment”, J. Lim, J. R. Almond, M. A. Trigatzis, J. A. Devlin, N. J. Fitch, B. E. Sauer, M. R. Tarbutt and E. A. Hinds, Phys. Rev. Lett. 120, 123201 (2018).  
3. “Molecules cooled below the Doppler limit”, S. Truppe, H. J. Williams, M. Hambach, L. Caldwell, N. J. Fitch, E. A. Hinds, B. E. Sauer and M. R. Tarbutt, Nature Physics 13, 1173 (2017).

José R. Crespo López-Urrutia

Group leader at Max-Planck-Institut für Kernphysik (MPIK), Heidelberg since 2001. He was lecturer at Freiburg University (1998-2001), postdoc at LLNL (1994-1998) and MPQ (1992-1994), PhD (2001) and physics studies at TU Graz, Austria.

Main interests: Atomic physics, QED, and astrophysics: High-precision spectroscopy from the visible to the x-rays with highly charged ions (HCI) , free-electron lasers, synchrotrons, ion traps, laser cooling, and frequency combs. His group is dedicated to the research of HCI, developing methods for their production, trapping, and spectroscopy. In particular, it has initiated the field of laser spectroscopy of HCI with conventional lasers and X-ray lasers. The laboratory comprises three superconducting electron beam ion traps (EBITs), several non-cryogenic EBITs, two cryogenic RF traps for sympathetic ion laser cooling, various X-ray/Soft X-ray/VUV spectrometers, and related instrumentation. A VUV frequency comb for precision frequency measurements at high photon energies is currently under construction. The group has recently pioneered the field sympathetic cooling and crystallization of highly charged ions [1], searches for transitions sensitive to time-variation of fundamental constants [2], and, in the last decade, soft X-ray laser spectroscopy using free-electron lasers [3], photoionization and resonant excitation of HCI with synchrotron radiation [4], and optical laser spectroscopy with HCI [5]. It closely collaborates with the German national metrology institute PTB (P. O. Schmidt) in the development of frequency metrology using trapped HCI, and with other experimental and theoretical groups at MPIK and elsewhere in the field of precision science with HCI.

Selected publications

1. L. Schmöger, O. O. Versolato, M. Schwarz, M. Kohnen, A. Windberger, B. Piest, S. Feuchtenbeiner, J. Pedregosa-Gutierrez, T. Leopold, P. Micke, A. K. Hansen, T. M. Baumann, M. Drewsen, J. Ullrich, P. O. Schmidt, and J. R. Crespo López-Urrutia, “Coulomb crystallization of highly charged ions”, Science 347, 1233 (2015).
2. A. Windberger et al., “Identification of the Predicted 5s − 4f Level Crossing Optical Lines with Applications to Metrology and Searches for the Variation of Fundamental Constants”, Phys. Rev. Lett. 114, 150801(2015).
3. S.W. Epp, et al., Soft X-Ray Laser Spectroscopy on Trapped Highly Charged Ions at FLASH, Phys. Rev. Lett. 98, 183001 (2007); S. Bernitt, et al., “An unexpectedly low oscillator strength as the origin of the Fe xvii emission problem”, Nature 492, 225 (2012).
4. M. C. Simon, et al., Resonant and near-threshold photoionization cross sections of Fe14+, Phys. Rev. Lett. 105, 183001 (2010); J. K. Rudolph, et al., “X-ray resonant photoexcitation: Linewidths and energies of Kα transitions in highly charged Fe ions”, Phys. Rev. Lett. 111, 103002 (2013).
5. V. Mäckel, et al., “Laser Spectroscopy on Forbidden Transitions in Trapped Highly Charged Ar13+ Ions”, Phys. Rev. Lett. 107 (2011) 143002.

Rick Bethlem

Rick Bethlem received his Ph.D. in Nijmegen on the deceleration and trapping of polar molecules using time-varying electric fields. He did post-docs at Imperial College London and the Fritz-Haber-Institut in Berlin. He is now associate professor at the Vrije Universiteit in Amsterdam. His research focuses on manipulating and cooling molecules and using cold molecules to perform precision tests of fundamental physics and chemistry theories.

Selected publications

1. “Cold Collisions in a Molecular Synchrotron,” A.P.P. van der Poel, P.C. Zieger, S.Y.T. van de Meerakker, J. Loreau,  A. van der Avoird, and H.L. Bethlem, Phys. Rev. Lett. 120, 033402 (2018).
“Molecular Fountain,” C. Cheng, A.P.P. van der Poel, P. Jansen, T.E. Wall, M. Quintero-Pérez, W. Ubachs, and H.L. Bethlem, Phys. Rev. Lett. 117, 253201 (2016).
“Methanol as a Sensitive Probe for Spatial and Temporal Variations of the Proton-to Electron Mass Ratio,”  P. Jansen, L.-H. Xu, I. Kleiner, W. Ubachs, and H.L. Bethlem, Phys. Rev. Lett. 106, 100801 (2011).

Last modified:05 April 2019 2.15 p.m.