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
General Chemistry, General Biochemistry,Genetics and Molecular Biology, General, General Physics and Astronomy
Electronic version(s)
https://doi.org/10.48550/arXiv.2206.03476 (Access: Open)
https://doi.org/10.1038/s41467-023-37153-0 (Access: Open)