Calculation of collective modes for the Bose-Hubbard model with confinement

被引：9
|
作者：
Lundh, E [1 ]
机构：
[1] AlbaNova, Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden
来源：
PHYSICAL REVIEW A | 2004年 / 70卷 / 06期
关键词：
D O I：
10.1103/PhysRevA.70.061602
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The collective excitations in the Bose-Hubbard model in a trap are studied by means of numerical diagonalization in one dimension. The strength function is calculated for monopole and dipole perturbations, and moments of the strength function are utilized in order to obtain information about the collective behavior under external forces. In the superfluid regime, the spectrum is found to be exhausted by one single frequency, while in systems that contain a Mott insulating plateau, several frequencies are excited. An explanation of recent experimental findings in terms of a Mott plateau is suggested.
引用
收藏
页码：061602 / 1
页数：4
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