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

Grigory E. Astrakharchik (), Luis A. Peña Ardila (), Krzysztof Jachymski and Antonio Negretti
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Grigory E. Astrakharchik: Universitat Politécnica de Catalunya
Luis A. Peña Ardila: Leibniz Universität Hannover
Krzysztof Jachymski: University of Warsaw
Antonio Negretti: Zentrum für Optische Quantentechnologien, Fachbereich Physik

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-37153-0

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