Quantum criticality in a bosonic Josephson junction (Articolo in rivista)

Type
Label
  • Quantum criticality in a bosonic Josephson junction (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevA.85.043625 (literal)
Alternative label
  • Buonsante P. [ 1,2,3 ] ; Burioni R. [ 1,4 ] ; Vescovi E. [ 1 ] ; Vezzani A. [ 1,5 ] (2012)
    Quantum criticality in a bosonic Josephson junction
    in Physical review. A
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Buonsante P. [ 1,2,3 ] ; Burioni R. [ 1,4 ] ; Vescovi E. [ 1 ] ; Vezzani A. [ 1,5 ] (literal)
Pagina inizio
  • 043625 (literal)
Pagina fine
  • 043625 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 85 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 11 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [ 1 ] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy [ 2 ] INO CNR, I-50019 Sesto Fiorentino, Italy [ 3 ] European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy [ 4 ] Ist Nazl Fis Nucl, Grp Collegato Parma, I-43100 Parma, Italy [ 5 ] CNR, Ist Nanosci, Ctr S3, I-41100 Modena, Italy (literal)
Titolo
  • Quantum criticality in a bosonic Josephson junction (literal)
Abstract
  • In this paper we consider a bosonic Josephson junction described by a two-mode Bose-Hubbard model, and we thoroughly analyze a quantum phase transition occurring in the system in the limit of infinite bosonic population. We discuss the relation between this quantum phase transition and the dynamical bifurcation occurring in the spectrum of the discrete self-trapping equations describing the system at the semiclassical level. In particular, we identify five regimes depending on the strength of the effective interaction among bosons, and study the finite-size effects arising from the finiteness of the bosonic population. We devote special attention to the critical regime which reduces to the dynamical bifurcation point in the thermodynamic limit of infinite bosonic population. Specifically, we highlight an anomalous scaling in the population imbalance between the two wells of the trapping potential, as well as in two quantities borrowed from quantum information theory, i.e., the entropy of entanglement and the ground-state fidelity. Our analysis is not limited to the zero-temperature case, but considers thermal effects as well. (literal)
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