Ionic polaron in a Bose-Einstein condensate

• URL: http://arxiv.org/abs/2005.12033v2
• Date: Wed, 12 May 2021 09:41:22 GMT
• Title: Ionic polaron in a Bose-Einstein condensate
• Authors: G. E. Astrakharchik, L. A. Pe\~na Ardila, R. Schmidt, K. Jachymski, A. Negretti
• Abstract summary: The presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects. We show that even in a relatively simple setup the competition of length scales gives rise to a highly correlated state. Our findings are directly relevant to experiments using hybrid atom-ion setups that have recently attained the ultracold regime.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects. Here we show that even in a comparatively simple setup consisting of a charged impurity in a weakly interacting bosonic medium the competition of length scales gives rise to a highly correlated mesoscopic state. Using quantum Monte Carlo simulations, we unravel its vastly different polaronic properties compared to neutral quantum impurities. Moreover, we identify a transition between the regime amenable to conventional perturbative treatment in the limit of weak atom-ion interactions and a many-body bound state with vanishing quasi-particle residue composed of hundreds of atoms. In order to analyze the structure of the corresponding states we examine the atom-ion and atom-atom correlation functions which both show nontrivial properties. Our findings are directly relevant to experiments using hybrid atom-ion setups that have recently attained the ultracold regime.

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