Many-body bound states and induced interactions of charged impurities in a bosonic bath

authored by

Grigory E. Astrakharchik, Luis A.Peña Ardila, Krzysztof Jachymski, Antonio Negretti

Abstract

Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this problem. Here, we investigate the static properties of one and two ionic impurities in a bosonic bath using quantum Monte Carlo methods. We identify three bipolaronic regimes depending on the strength of the atom-ion potential and the number of its two-body bound states: a perturbative regime resembling the situation of a pair of neutral impurities, a non-perturbative regime that loses the quasi-particle character of the former, and a many-body bound state regime that can arise only in the presence of a bound state in the two-body potential. We further reveal strong bath-induced interactions between the two ionic polarons. Our findings show that numerical simulations are indispensable for describing highly correlated impurity models.

Organisation(s)

QuantumFrontiers
Institute of Theoretical Physics

External Organisation(s)

Universitat Politècnica de Catalunya
Universitat de Barcelona
University of Warsaw
Zentrum für Optische Quantentechnologien (ZOQ)

Type

Article

Journal

Nature Communications

Volume

14

No. of pages

11

ISSN

2041-1723

Publication date

24.03.2023

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Chemistry(all), Biochemistry, Genetics and Molecular Biology(all), General, Physics and Astronomy(all)

Electronic version(s)

https://doi.org/10.48550/arXiv.2206.03476 (Access: Open)
https://doi.org/10.1038/s41467-023-37153-0 (Access: Open)