Repulsive Fermi and Bose Polarons in Quantum Gases

Autor: Francesco Scazza, Matteo Zaccanti, Pietro Massignan, Meera M. Parish, Jesper Levinsen
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Atoms, Vol 10, Iss 2, p 55 (2022)
Druh dokumentu: article
ISSN: 10020055
2218-2004
DOI: 10.3390/atoms10020055
Popis: Polaron quasiparticles are formed when a mobile impurity is coupled to the elementary excitations of a many-particle background. In the field of ultracold atoms, the study of the associated impurity problem has attracted a growing interest over the last fifteen years. Polaron quasiparticle properties are essential to our understanding of a variety of paradigmatic quantum many-body systems realized in ultracold atomic gases and in the solid state, from imbalanced Bose–Fermi and Fermi–Fermi mixtures to fermionic Hubbard models. In this topical review, we focus on the so-called repulsive polaron branch, which emerges as an excited many-body state in systems with underlying attractive interactions such as ultracold atomic mixtures, and is characterized by an effective repulsion between the impurity and the surrounding medium. We give a brief account of the current theoretical and experimental understanding of repulsive polaron properties, for impurities embedded in both fermionic and bosonic media, and we highlight open issues deserving future investigations.
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