Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Poster VIII
A 35.13: Poster
Donnerstag, 14. März 2024, 17:00–19:00, Tent C
Synthetic dimension-induced pseudo Jahn-Teller effect in one-dimensional confined fermions — •André Becker1,2, Georgios M. Koutentakis3, and Peter Schmelcher1,2 — 1Center for Optical Quantum Technologies, Department of Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg Germany — 2The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 3Institute of Science and Technology Austria (ISTA), am Campus 1, 3400 Klosterneuburg, Austria
We demonstrate the failure of the adiabatic Born-Oppenheimer approximation to describe the ground state of a quantum impurity within an ultracold Fermi gas despite substantial mass differences between the bath and impurity species. Increasing repulsion leads to the appearance of non-adiabatic couplings between the fast bath and slow impurity degrees of freedom which reduce the parity symmetry of the latter according to the pseudo Jahn-Teller effect. The presence of this mechanism is associated to a conical intersection involving the impurity position and the inverse of the interaction strength which acts as a synthetic dimension. We elucidate the presence of these effects via a detailed ground state analysis involving the comparison of ab initio fully-correlated simulations with effective models. Our study suggests ultracold atomic ensembles as potent emulators of complex molecular phenomena.
Keywords: Fermi gases; Mixtures of atomic quantum gases; Polarons; Pseudo Jahn-Teller effect; Spontaneous symmetry breaking