%0 Journal Article
%A Astrakharchik, Grigory E.
%A Ardila, Luis A. Peña
%A Schmidt, Richard
%A Jachymski, Krzysztof
%A Negretti, Antonio
%T Ionic polaron in a Bose-Einstein condensate
%J Communications Physics
%V 4
%N 1
%@ 2399-3650
%C London
%I Springer Nature
%M FZJ-2021-06160
%P 94
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000649372600001
%R 10.1038/s42005-021-00597-1
%U https://juser.fz-juelich.de/record/904590