Zoo of quantum phases and excitations of cold bosonic atoms in optical lattices

Ofir E. Alon, Alexej I. Streltsov, Lorenz S. Cederbaum

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum phases and phase transitions of weakly to strongly interacting bosonic atoms in deep to shallow optical lattices are described by a single multiorbital mean-field approach in real space. For weakly interacting bosons in one dimension, the critical value of the superfluid to Mott insulator (MI) transition found is in excellent agreement with many-body treatments of the Bose-Hubbard model. For strongly interacting bosons, (i)additional MI phases appear, for which two (or more) atoms residing in each site undergo a Tonks-Girardeau-like transition and localize, and (ii)on-site excitation becomes the excitation lowest in energy. Experimental implications are discussed.

Original languageEnglish
Article number030405
JournalPhysical Review Letters
Volume95
Issue number3
DOIs
StatePublished - 15 Jul 2005
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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