Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 51: Ultra-cold Atoms, Ions and BEC III (joint session A/Q)
Q 51.3: Vortrag
Donnerstag, 5. März 2026, 11:45–12:00, N 1
Time resolved formation dynamics of a heavy Fermi polaron — •Tobias Krom1, Michael Rautenberg1, Eugen Dizer2, Richard Schmidt2, Olivier Bleu2, Tilman Enss2, Lauriane Chomaz1, and Matthias Weidemüller1 — 1Physikalisches Institut, University of Heidelberg — 2Institute for Theoretical Physics, University of Heidelberg
We study the decoherence of 133Cs impurities within a Fermi sea (3D) of 6Li. As we show, this interacting system of impurities and a degenerate Fermi sea can be well described by the quasiparticle picture introduced by Landau’s Fermi liquid theory [1]. The behavior of these emerging quasiparticles scales with the Fermi sea characteristics which allows for complementary studies on different systems. While in metals the Fermi Energy is a few electron volts and its corresponding shortest reaction time τF is on the order of 100 attoseconds, ultracold atoms experiments provide much more accessible timescales in the microsecond regime [2].
The chosen combination of atomic species provides the highest mass ratio of 22.2 which can be realized with alkali atoms. Due to this, current quasiparticle theory models cannot fully predict the dynamics, making this experiment a perfect testbed for state-of-the-art polaron theories [3,4].
[1] G. Baym and C. Pethick, Landau Fermi Liquid Theory, 1991
[2] M. Cetina et al 2015 Phys. Rev. Lett. 115, 135302
[3] R. Schmidt et al 2018 Rep. Prog. Phys. 81 024401
[4] Chen et al 2025 Phys. Rev. Lett. 135, 193401
Keywords: polaron; Ramsey; lithium; cesium; Fermi polaron