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A: Fachverband Atomphysik
A 28: Poster Session - Atomic Physics IV
A 28.1: Poster
Donnerstag, 12. März 2020, 16:00–18:00, Empore Lichthof
Strong interacting polaron and bi-polaron in 1D: beyond the extended Fröhlich model — •Martin Will1, Jonas Jager2, Ryan Barnett2, and Michael Fleischhauer1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Mathematics, Imperial College London, London SW7 2AZ, United Kingdom
We discuss the interaction of mobile impurities with a surrounding condensate in 1D. For a large impurity-condensate coupling the usual approach of linearizing around a constant condensate density (extended Fröhlich model) does not account correctly for deformations of the BEC and is therefore no longer applicable. We give an alternative approach, taking into account the condensate deformation already on a mean field level, which can be solved analytically [1]. The energy and effective mass of the polaron quasi-particle agree well with quasi exact quantum Monte-Carlo calculations and improve substantially on approaches based on an undepleted BEC [2]. We present the mean-field solution for one as well as two impurities immersed in the condensate from which an effective impurity-impurity interaction potential, mediated through the condensate, is derived.
[1] V. Hakim Phys. Rev. E 55, 2835-2845 (1997)
[2] F. Grusdt, G. Astrakharchik, E. Demler New J. of Phys. 19.10, 103035 (2017)