Bragg spectroscopy of the multibranch Bogoliubov spectrum of elongated Bose-Einstein condensates

被引：69

作者：

Steinhauer, J ^{[1
]}

Katz, N

Ozeri, R

Davidson, N

Tozzo, C

Dalfovo, F

机构：

[1] Weizmann Inst Sci, Dept Phys Complex Syst, IL-76100 Rehovot, Israel

[2] Univ Cattolica Sacro Cuore, Dipartimento Matemat & Fis, Brescia, Italy

[3] BEC INFM, Trent, Italy

[4] INFM, Brescia, Italy

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.90.060404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure the response of an elongated Bose-Einstein condensate to a two-photon Bragg pulse. If the duration of the pulse is long, the total momentum transferred to the condensate exhibits a nontrivial behavior which reflects the structure of the underlying Bogoliubov spectrum. It is thus possible to perform a spectroscopic analysis in which axial phonons with a different number of radial nodes are resolved. The local density approximation is shown to fail in this regime, while the observed data agree well with the results of simulations based on the numerical solution of the Gross-Pitaevskii equation.

引用

页数：4

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