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Bose polarons at finite temperature and strong coupling

Author
Guenther, N.; Massignan, P.; Lewenstein, M.; Bruun, G. M.
Type of activity
Journal article
Journal
Physical review letters
Date of publication
2018-02-01
Volume
120
Number
5
First page
1
Last page
6
DOI
https://doi.org/10.1103/PhysRevLett.120.050405 Open in new window
Repository
http://hdl.handle.net/2117/116050 Open in new window
URL
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.050405 Open in new window
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 Tc, the critical temperature for Bose-Einstein condensation, and it becomes overdamped when T»Tc. The quasiparticle ...
Citation
Guenther, N., Massignan, P., Lewenstein, M., Bruun, G. Bose polarons at finite temperature and strong coupling. "Physical review letters", 1 Febrer 2018, vol. 120, núm. 5, p. 1-6.
Keywords
Bose-Einstein condensates, Bose-Fermi mixtures, Mixtures of atomic and/or molecular quantum gases, Polarons
Group of research
SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity

Participants

  • Guenther, Nils Eric  (author)
  • Massignan, Pietro Alberto  (author)
  • Lewenstein, Maciej  (author)
  • Bruun, Georg M.  (author)