Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.050405
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Funding
- Spanish MINECO [Severo Ochoa SEV-2015-0522, FisicaTeAMO FIS2016-79508-P]
- Generalitat de Catalunya [SGR 874, CERCA]
- Fundacio Privada Cellex
- EU Grant EQuaM (FP7) [323714]
- EU Grant OSYRIS (ERC AdG)
- EU Grant QUIC [H2020-FETProAct-2014 641122]
- EU Grant SIQS [FP7-ICT-2011-9 600645]
- la Caixa-Severo Ochoa PhD fellowship
- Ramon y Cajal program
- Simons Foundation
- NSF [PHY-1607611]
- Villum Foundation [VKR023163]
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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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