Phase coherence of an atomic Mott insulator -: art. no. 050404

被引：143

作者：

Gerbier, F ^{[1
]}

Widera, A ^{[1
]}

Fölling, S ^{[1
]}

Mandel, O ^{[1
]}

Gericke, T ^{[1
]}

Bloch, I ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.95.050404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the phase coherence properties of ultracold Bose gases in optical lattices, with special emphasis on the Mott insulating phase. We show that phase coherence on short length scales persists even deep in the insulating phase, preserving a finite visibility of the interference pattern observed after free expansion. This behavior can be attributed to a coherent admixture of particle-hole pairs to the perfect Mott state for small but finite tunneling. In addition, small but reproducible kinks are seen in the visibility, in a broad range of atom numbers. We interpret them as signatures for density redistribution in the shell structure of the trapped Mott insulator.

引用

页数：4

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