Temperature in One-Dimensional Bosonic Mott insulators

Details Temperature in One-Dimensional Bosonic Mott insulators Temperature in One-Dimensional Bosonic Mott insulators

2005-04-27

arxiv.org/abs/cond-mat/0504724v2

Physical Review A 72, 063609 (2005)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 7 figures

Scientific paper

10.1103/PhysRevA.72.063609

The Mott insulating phase of a one-dimensional bosonic gas trapped in optical lattices 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.

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