Journal
ATOMS
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/atoms10020055
Keywords
Fermi polarons; Bose polarons; repulsive interactions; metastable quasiparticles; quasiparticle lifetime; mediated interactions; repulsive Fermi gas; ultracold atomic mixtures
Categories
Funding
- European Research Council (ERC) under the European Union [949438]
- ERC [637738 PoLiChroM]
- Italian MIUR through the FARE grant [R168HMHFYM]
- MCIN/AEI [PID2020-113565GB-C21]
- EU FEDER Quantumcat
- National Science Foundation [NSF PHY-1748958]
- ICREA Academia program
- Australian Research Council Centre of Excellence in Future Low-Energy Electronics Technologies [CE170100039]
- Australian Research Council [FT160100244, FT200100619, DP210101652]
- Australian Research Council [FT200100619] Funding Source: Australian Research Council
- European Research Council (ERC) [949438] Funding Source: European Research Council (ERC)
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This article provides an overview of the current theoretical and experimental understanding of the properties of repulsive polarons, which are quasiparticles formed by coupling a mobile impurity to the elementary excitations of a many-particle background. The study of these quasiparticles is important for understanding various quantum many-body systems in ultracold atomic gases and in the solid state. The article also highlights unresolved issues that deserve further investigation.
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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