Spectral weight redistribution in strongly correlated bosons in optical lattices (Articolo in rivista)

Type
Label
  • Spectral weight redistribution in strongly correlated bosons in optical lattices (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Menotti, C; Trivedi, N (2008)
    Spectral weight redistribution in strongly correlated bosons in optical lattices
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Menotti, C; Trivedi, N (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 77 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Menotti, C.] ICFO Inst Ciencies Fonton, E-08860 Barcelona, Spain; [Menotti, C.] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; [Menotti, C.] Univ Trent, CNR INFM BEC, I-38050 Trento, Italy; Ohio State Univ, Dept Phys, Columbus, OH 43210 USA (literal)
Titolo
  • Spectral weight redistribution in strongly correlated bosons in optical lattices (literal)
Abstract
  • \"We calculate the single-particle spectral function for the one-band Bose-Hubbard model within the random-phase approximation (RPA). In the strongly correlated superfluid, in addition to the gapless phonon excitations, we find extra gapped modes, which become particularly relevant near the superfluid-Mott quantum phase transition (QPT). The strength in one of the gapped modes, a precursor of the Mott phase, grows as the QPT is approached and evolves into a hole (particle) excitation in the Mott insulator depending on whether the chemical potential mu is above (below) the tip of the lobe. The sound velocity c of the Goldstone modes remains finite when the transition is approached at constant density; otherwise, it vanishes at the transition. It agrees well with Bogoliubov theory except close to the transition. We also calculate the spatial correlations for bosons in an inhomogeneous trapping potential creating alternating shells of Mott insulator and superfluid. Finally, we discuss the capability of the RPA to correctly account for quantum fluctuations in the vicinity of the QPT.\" (literal)
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