Research Group Prof. Ulmer
The experiments conducted within our laboratory use methods of atomic, molecular, optical physics and quantum technologies, to test the standard model of particle physics at low energy. Using advanced Penning trap systems, we compare the fundamental properties of protons [1] and antiprotons [2, 3] with highest possible precision to test the fundamental charge, parity, time reversal invariance (matter/antimatter symmetry). Using our data, we search for time dependent signatures imposed by Physics beyond the Standard Model. Following these approaches, we have for example set most stringent limits on asymmetric antimatter/dark matter interaction [4]. Furthermore, our sensitive superconducting single particle detectors and low-noise traps [5] allow us to operate our experiments as sensitive detectors for light dark matter [6], such as axions and milli-charged particles.
[1] A 16 parts-per-trillion measurement of the antiproton-to-proton charge-mass ratio
M. J. Borchert, J. A. Devlin, S. Erlewein, M. Fleck, J. A. Harrington, B. Latacz, E. Wursten, A. H. Mooser, M. A. Bohman, V. Grunhofer, C. Smorra, M. Wiesinger, C. Will, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, S. Ulmer
Nature 601, 53 (2022).
[2] Double-trap measurement of the proton magnetic moment at 0.3 parts per billion precision
G. Schneider, A. Mooser, M. Bohman, N. Schön, J. Harrington, T. Higuchi, H. Nagahama, S. Sellner, C. Smorra, K. Blaum, Y. Matsuda, W. Quint, J. Walz, S. Ulmer
Science 358, 1081 (2017)
[3] A parts-per-billion measurement of the antiproton magnetic moment
C. Smorra, S. Sellner, M. J. Borchert, J. A. Harrington, T. Higuchi, H. Nagahama, T. Tanaka, A. Mooser, G. Schneider, M. Bohman, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki and S. Ulmer
Nature 550, 371-374 (2017)
[4] Direct Limits on the Interaction of Antiprotons with Axion-Like Dark Matter
C. Smorra, Y. Stadnik, M. Bohman, M. J. Borchert, S. Erlewein, J. A. Harrington, J. A. Devlin, P.E. Blessing, T. Higuchi, M. Wiesinger, G. Schneider, A. Mooser, K. Blaum, Y. Matsuda, W. Quint, J. Walz, D. Budker, and S. Ulmer
Nature 575, 310 (2019).
[5] Measurement of Ultra-Low Heating Rates in a Cryogenic Penning Trap.
M. J. Borchert, P.E. Blessing, J.A. Devlin, J. A. Harrington, T. Higuchi, J. Morgner, E. Wursten, M. Bohman, M. Wiesinger, C. Smorra, K. Blaum, Y. Matsuda, W. Quint, J. Walz, and S. Ulmer
Phys. Rev. Lett. 122, 043201 (2019).
[6] Constraints on the coupling between axion-like dark matter and photons using an antiproton superconducting tuned detection circuit in a cryogenic Penning trap
J. A. Devlin, M. J. Borchert, S. Erlewein, M. Fleck, J. A. Harrington, B. Latacz, J. Warncke, E. Wursten, M. A. Bohman, A. H. Mooser, C. Smorra, M. Wiesinger, C. Will, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, S. Ulmer
Phys. Rev. Lett. 126, 041301 (2021).