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| dc.contributor | Universitat Politècnica de Catalunya. Departament de Física |
|---|---|
| dc.contributor | Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada |
| dc.contributor.author | Guenther, Nils Eric |
| dc.contributor.author | Massignan, Pietro Alberto |
| dc.contributor.author | Lewenstein, Maciej |
| dc.contributor.author | Bruun, Georg |
| dc.date | 2018-02-01 |
| dc.identifier.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. |
| dc.identifier.citation | 0031-9007 |
| dc.identifier.citation | 10.1103/PhysRevLett.120.050405 |
| dc.identifier.uri | http://hdl.handle.net/2117/116050 |
| dc.description.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 with higher energy instead exists only below Tc, 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. |
| dc.description.abstract | Peer Reviewed |
| dc.language.iso | eng |
| dc.relation | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.050405 |
| dc.rights | info:eu-repo/semantics/openAccess |
| dc.subject | Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica |
| dc.subject | Quantum theory |
| dc.subject | Bose-Einstein condensates |
| dc.subject | Bose-Fermi mixtures |
| dc.subject | Mixtures of atomic and/or molecular quantum gases |
| dc.subject | Polarons |
| dc.subject | Quàntums, Teoria dels |
| dc.title | Bose polarons at finite temperature and strong coupling |
| dc.type | info:eu-repo/semantics/submittedVersion |
| dc.type | info:eu-repo/semantics/article |
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