Temperature in one-dimensional bosonic Mott insulators

Journal Article · Thu Dec 15 00:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.72.0· OSTI ID:20786346

Reischl, A ^[1]; Schmidt, K P ^[2]; Uhrig, G S ^[3]

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1. Institut fuer Theoretische Physik, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Cologne (Germany)
2. Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne, CH 1015 Lausanne (Switzerland)
3. Theoretische Physik, Geb. E2.6, FR 7.1, Universitaet des Saarlandes, D-66123 Saarbruecken (Germany)

The Mott insulating phase of a one-dimensional bosonic gas trapped in an optical lattice is described by a Bose-Hubbard model. A continuous unitary transformation is used to map this model onto an effective model conserving the number of elementary excitations. We obtain quantitative results for the kinetics and for the spectral weights of the low-energy excitations for a broad range of parameters in the insulating phase. By these results, recent Bragg spectroscopy experiments are explained. Evidence for a significant temperature of the order of the microscopic energy scales is found.

• OSTI ID: 20786346
• Journal Information: Physical Review. A, Vol. 72, Issue 6; Other Information: DOI: 10.1103/PhysRevA.72.063609; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BOSONS
EXCITATION
HUBBARD MODEL
KINETICS
ONE-DIMENSIONAL CALCULATIONS
SPECTROSCOPY
TRANSFORMATIONS
TRAPPING