Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.20: Poster

Tuesday, March 12, 2024, 17:00–19:00, KG I Foyer

Polarons and bi-polarons in strongly interacting 1D Bose gases — •Dennis Breu, Martin Will, and Michael Fleischhauer — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

We investigate the ground state, the dynamics and effective interactions of quantum impurities immersed in an interacting 1D Bose gas utilising Tensor Network simulations. The algorithm allows us to theoretically probe Bose polarons in the regime of strong interactions in the Bose gas for the full range of Tonks parameters γ. We calculate the polaron binding energy as well as Born-Oppenheimer polaron interaction potentials and bi-polaron bound states and compare them to analytical predictions in the weak and strong coupling regimes. Furthermore we investigate the dynamics of a single finite mass impurity inside a finite size 1D Bose gas. Here we find a crossover to a localised impurity at the edges of the system instead of one that is spread over the whole system. Finally by making use of time-evolving block decimation (TEBD) we study the dynamics of impurities accelerated by a constant force inside a strong interacting 1D Bose gas and find oscillations reminiscent of Bloch oscillations.

Keywords: strong interacting; polarons; theoretical; simulations