Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Ultra-cold Atoms, Ions and BEC IV (joint session A/Q)

Q 58.6: Talk

Friday, March 15, 2024, 12:15–12:30, HS 1098

Emergence of a Bose polaron in a small ring threaded by the Aharonov-Bohm flux — •Fabian Brauneis¹, Areg Ghazaryan², Hans-Werner Hammer^{1, 3}, and Artem Volosniev² — ¹Technische Universität Darmstadt, Department of Physics, 64289 Darmstadt, Germany — ²Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria — ³ExtreMe Matter Institute EMMI and Helmholtz Forschungsakademie Hessen für FAIR (HFHF), 64291 Darmstadt, Germany

The model of a ring threaded by the Aharonov-Bohm flux underlies our understanding of a coupling between gauge potentials and matter. The typical formulation of the model is based upon a single particle picture, and should be extended when interactions with other particles become relevant. Here, we illustrate such an extension for a particle in an Aharonov-Bohm ring subject to interactions with a weakly interacting Bose gas. Our findings demonstrate that the system's ground state can be effectively characterized using the Bose polaron concept -- a particle dressed by interactions with a bosonic environment. Our results suggest the Aharonov-Bohm ring as a platform for the few- to many-body crossover of quasi-particles that arise from an impurity immersed in a medium.

This work has received funding from the DFG Project no. 413495248 [VO 2437/1-1].

Keywords: Polaron; Few-to-many-body crossover; Bose-Einstein condensate