Journal Article

FZJ-2021-06160

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ionic polaron in a Bose-Einstein condensate

Astrakharchik, G. E. (Corresponding author) ; Ardila, L. A. P. ; Schmidt, R. ; Jachymski, K.FZJ* ; Negretti, A.

2021
Springer Nature London

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Please use a persistent id in citations: http://hdl.handle.net/2128/30738  doi:10.1038/s42005-021-00597-1

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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Contributing Institute(s):

1. Quantum Control (PGI-8)

Research Program(s):

1. 2124 - Advanced research methodologies for tomorrow (POF4-212) (POF4-212)
2. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)

Appears in the scientific report 2021

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