TY  - JOUR
AU  - Astrakharchik, Grigory E.
AU  - Ardila, Luis A. Peña
AU  - Schmidt, Richard
AU  - Jachymski, Krzysztof
AU  - Negretti, Antonio
TI  - Ionic polaron in a Bose-Einstein condensate
JO  - Communications Physics
VL  - 4
IS  - 1
SN  - 2399-3650
CY  - London
PB  - Springer Nature
M1  - FZJ-2021-06160
SP  - 94
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000649372600001
DO  - DOI:10.1038/s42005-021-00597-1
UR  - https://juser.fz-juelich.de/record/904590
ER  -