Buffer-Gas Cooled Bose-Einstein Condensate

被引：43

作者：

Doret, S. Charles ^{[1
,3
]}

Connolly, Colin B. ^{[1
,3
]}

Ketterle, Wolfgang ^{[2
,3
]}

Doyle, John M. ^{[1
,3
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

[3] Harvard MIT Ctr Ultracold Atoms, Cambridge, MA 02138 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 10期

基金：

美国国家科学基金会;

关键词：

IOFFE-CONFIGURATION TRAP; METASTABLE HELIUM; ATOMS;

D O I：

10.1103/PhysRevLett.103.103005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the creation of a Bose-Einstein condensate using buffer-gas cooling, the first realization of Bose-Einstein condensation using a broadly general method which relies neither on laser cooling nor unique atom-surface properties. Metastable helium ((4)He(*)) is buffer-gas cooled, magnetically trapped, and evaporatively cooled to quantum degeneracy. 10(11) atoms are initially trapped, leading to Bose-Einstein condensation at a critical temperature of 5 mu K and threshold atom number of 1.1x10(6). This method is applicable to a wide array of paramagnetic atoms and molecules, many of which are impractical to laser cool and impossible to surface cool.

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