Excitations of a superfluid in a three-dimensional optical lattice -: art. no. 240402

被引：104

作者：

Schori, C ^{[1
]}

Stöferle, T ^{[1
]}

Moritz, H ^{[1
]}

Köhl, M ^{[1
]}

Esslinger, T ^{[1
]}

机构：

[1] ETH, Inst Quantum Elect, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.93.240402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We prepare a Bose-Einstein condensed gas in a three-dimensional optical lattice and study the excitation spectrum of the superfluid phase for different interaction strengths. We probe the response of the system by modulating the depth of the optical lattice along one axis. The interactions can be controlled independently by varying the tunnel coupling along the other two lattice axes. In the weakly interacting regime we observe a small susceptibility of the superfluid to excitations, while for stronger interactions an unexpected resonance appears in the excitation spectrum. In addition we measure the coherent fraction of the atomic gas, which determines the depletion of the condensate.

引用

页数：4

共 22 条

[1] Macroscopic quantum interference from atomic tunnel arrays [J].