Zoo of Quantum Phases and Excitations of Cold Bosonic Atoms in Optical Lattices

Journal Article · Fri Jul 15 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.030405· OSTI ID:20696442

Alon, Ofir E; Streltsov, Alexej I; Cederbaum, Lorenz S ^[1]

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1. Theoretische Chemie, Physikalisch-Chemisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

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.

• OSTI ID: 20696442
• Journal Information: Physical Review Letters, Vol. 95, Issue 3; Other Information: DOI: 10.1103/PhysRevLett.95.030405; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
BEAM OPTICS
BOSONS
EXCITATION
HUBBARD MODEL
MANY-BODY PROBLEM
MEAN-FIELD THEORY
PHASE TRANSFORMATIONS
QUANTUM MECHANICS
SUPERFLUIDITY