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Article Dans Une Revue Physical Review Letters Année : 2005

Phase coherence of an atomic Mott insulator

Fabrice Gerbier
Artur Widera
  • Fonction : Auteur
Simon Foelling
  • Fonction : Auteur
Olaf Mandel
  • Fonction : Auteur
Tatjana Gericke
  • Fonction : Auteur
Immanuel Bloch
  • Fonction : Auteur

Résumé

We investigate the phase coherence properties of ultracold Bose gases in optical lattices, with special emphasis on the Mott insulating phase. We show that phase coherence on short length scales persists even deep in the insulating phase, preserving a finite visibility of the interference pattern observed after free expansion. This behavior can be attributed to a coherent admixture of particle/hole pairs to the perfect Mott state for small but finite tunneling. In addition, small but reproducible ``kinks'' are seen in the visibility, in a broad range of atom numbers. We interpret them as signatures for density redistribution in the shell structure of the trapped Mott insulator.

Dates et versions

hal-00116291 , version 1 (25-11-2006)

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Fabrice Gerbier, Artur Widera, Simon Foelling, Olaf Mandel, Tatjana Gericke, et al.. Phase coherence of an atomic Mott insulator. Physical Review Letters, 2005, 95, pp.050404. ⟨10.1103/PhysRevLett.95.050404⟩. ⟨hal-00116291⟩
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