Ionic polaron in a Bose-Einstein condensate

verfasst von
Grigory E. Astrakharchik, Luis A.Peña Ardila, Richard Schmidt, Krzysztof Jachymski, Antonio Negretti
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.

Organisationseinheit(en)
Institut für Theoretische Physik
QuantumFrontiers
Externe Organisation(en)
Universitat Politècnica de Catalunya
Max-Planck-Institut für Quantenoptik (MPQ)
Munich Center for Quantum Science and Technology (MCQST)
Forschungszentrum Jülich
Uniwersytet Warszawski
Universität Hamburg
Typ
Artikel
Journal
Communications Physics
Band
4
Publikationsdatum
11.05.2021
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Physik und Astronomie (insg.)
Elektronische Version(en)
https://doi.org/10.1038/s42005-021-00597-1 (Zugang: Offen)