Bose Polarons at Finite Temperature and Strong Coupling

Physical Review Letters
Nils-Eric GuentherGeorg M Bruun

Abstract

A mobile impurity coupled to a weakly interacting Bose gas, a Bose polaron, displays several interesting effects. While a single attractive quasiparticle is known to exist at zero temperature, we show here that the spectrum splits into two quasiparticles at finite temperatures for sufficiently strong impurity-boson interaction. The ground state quasiparticle has minimum energy at T_{c}, the critical temperature for Bose-Einstein condensation, and it becomes overdamped when T≫T_{c}. The quasiparticle with higher energy instead exists only below T_{c}, since it is a strong mixture of the impurity with thermally excited collective Bogoliubov modes. This phenomenology is not restricted to ultracold gases, but should occur whenever a mobile impurity is coupled to a medium featuring a gapless bosonic mode with a large population for finite temperature.

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Citations

Jun 5, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Abdelaali BoudjemaaSofyan Khlifa-Karfa
Feb 9, 2019·Physical Review Letters·Mohammad MehboudiMaciej Lewenstein
May 31, 2019·Physical Review Letters·S I MistakidisP Schmelcher
Apr 11, 2020·Science·Zoe Z YanMartin W Zwierlein
Aug 28, 2020·Physical Review Letters·Weizhe Edward LiuMeera M Parish
Jul 22, 2018·Physical Review Letters·A Camacho-GuardianG M Bruun
Jun 8, 2019·Physical Review Letters·Weizhe Edward LiuMeera M Parish
Jun 23, 2020·Physical Review Letters·David DzsotjanMichael Fleischhauer
Apr 10, 2021·Physical Review Letters·Pietro MassignanVictor Gurarie

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