Superstripes and the Excitation Spectrum of a Spin-Orbit-Coupled Bose-Einstein Condensate (Articolo in rivista)

Type
Label
  • Superstripes and the Excitation Spectrum of a Spin-Orbit-Coupled Bose-Einstein Condensate (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevLett.110.235302 (literal)
Alternative label
  • Li, Yun; Martone, Giovanni I.; Pitaevskii, Lev P.; Stringari, Sandro (2013)
    Superstripes and the Excitation Spectrum of a Spin-Orbit-Coupled Bose-Einstein Condensate
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Li, Yun; Martone, Giovanni I.; Pitaevskii, Lev P.; Stringari, Sandro (literal)
Pagina inizio
  • 235302 (literal)
Pagina fine
  • 235302 (literal)
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  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84878849215&partnerID=q2rCbXpz (literal)
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  • 110 (literal)
Rivista
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  • 5 (literal)
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  • 23 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • INO-CNR BEC Center, Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy; Kapitza Institute for Physical Problems, RAS, Kosygina 2, 119334 Moscow, Russian Federation (literal)
Titolo
  • Superstripes and the Excitation Spectrum of a Spin-Orbit-Coupled Bose-Einstein Condensate (literal)
Abstract
  • Using Bogoliubov theory we calculate the excitation spectrum of a spinor Bose-Einstein condensed gas with an equal Rashba and Dresselhaus spin-orbit coupling in the stripe phase. The emergence of a double gapless band structure is pointed out as a key signature of Bose-Einstein condensation and of the spontaneous breaking of translational invariance symmetry. In the long wavelength limit the lower and upper branches exhibit, respectively, a clear spin and density nature. For wave vectors close to the first Brillouin zone, the lower branch acquires an important density character responsible for the divergent behavior of the structure factor and of the static response function, reflecting the occurrence of crystalline order. The sound velocities are calculated as functions of the Raman coupling for excitations propagating orthogonal and parallel to the stripes. Our predictions provide new perspectives for the identification of supersolid phenomena in ultracold atomic gases. (literal)
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