Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 72: Ultra-cold Atoms, Ions and BEC V (joint session A/Q)
Q 72.7: Vortrag
Freitag, 14. März 2025, 12:30–12:45, GrHS Mathe
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 nonadiabatic 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: Non-adiabatic physics; Ultracold atoms; Few-body physics; non-equlibrium quantum dynamics