Bogoliubov speed of sound for a dilute Bose-Einstein condensate in a 3d optical lattice

被引：13

作者：

Boers, D ^{[1
]}

Weiss, C ^{[1
]}

Holthaus, M ^{[1
]}

机构：

[1] Carl von Ossietzky Univ Oldenburg, Inst Phys, D-26111 Oldenburg, Germany

来源：

EUROPHYSICS LETTERS | 2004年 / 67卷 / 06期

关键词：

D O I：

10.1209/epl/i2004-10140-7

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We point out that the velocity of propagation of sound wavepackets in a Bose-Einstein condensate filling a three-dimensional cubic optical lattice undergoes a maximum with increasing lattice depth. For a realistic choice of parameters, the maximum sound velocity in a lattice condensate can exceed the sound velocity in a homogeneous condensate with the same average density by 30%. The maximum falls into the superfluid regime, and should be observable under currently achievable laboratory conditions.

引用

页码：887 / 892

页数：6

共 24 条

[1]

Abramowitz M., 1970, HDB MATH FUNCTIONS

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

Anderson, BP ;

Kasevich, MA .

SCIENCE, 1998, 282 (5394) :1686-1689

[3] Bose-Einstein condensates in spatially periodic potentials [J].

Berg-Sorensen, K ;

Molmer, K .

PHYSICAL REVIEW A, 1998, 58 (02) :1480-1484

[4] Josephson junction arrays with Bose-Einstein condensates [J].

Cataliotti, FS ;

Burger, S ;

Fort, C ;

Maddaloni, P ;

Minardi, F ;

Trombettoni, A ;

Smerzi, A ;

Inguscio, M .

SCIENCE, 2001, 293 (5531) :843-846

[5] Collective excitations of a periodic Bose condensate in the Wannier representation [J].

Chiofalo, ML ;

Polini, M ;

Tosi, MP .

EUROPEAN PHYSICAL JOURNAL D, 2000, 11 (03) :371-378

[6] Bose-Einstein condensates in an optical lattice [J].

Choi, DI ;

Niu, Q .

PHYSICAL REVIEW LETTERS, 1999, 82 (10) :2022-2025

[7]

FISHER MPA, 1989, PHYS REV B, V40, P546, DOI [10.1103/PhysRevB.40.546, 10.1063/1.38820]

[8] Collapse and revival of the matter wave field of a Bose-Einstein condensate [J].

Greiner, M ;

Mandel, O ;

Hänsch, TW ;

Bloch, I .

NATURE, 2002, 419 (6902) :51-54

[9] Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms [J].

Greiner, M ;

Mandel, O ;

Esslinger, T ;

Hänsch, TW ;

Bloch, I .

NATURE, 2002, 415 (6867) :39-44

[10] Exploring phase coherence in a 2D lattice of Bose-Einstein condensates -: art. no. 160405 [J].

Greiner, M ;

Bloch, I ;

Mandel, O ;

Hänsch, TW ;

Esslinger, T .

PHYSICAL REVIEW LETTERS, 2001, 87 (16)

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