Temperature in one-dimensional bosonic Mott insulators

被引：27
|
作者：
Reischl, A
Schmidt, KP
Uhrig, GS
机构：
[1] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany
[2] Ecole Polytech Fed Lausanne, Inst Theoret Phys, CH-1015 Lausanne, Switzerland
[3] Univ Saarland, D-66123 Saarbrucken, Germany
来源：
PHYSICAL REVIEW A | 2005年 / 72卷 / 06期
关键词：
D O I：
10.1103/PhysRevA.72.063609
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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.
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页数：7
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