Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap

被引：446

作者：

Ryu, C. ^{[1
,2
,3
]}

Andersen, M. F. ^{[1
]}

Clade, P. ^{[1
]}

Natarajan, Vasant ^{[1
]}

Helmerson, K. ^{[1
,2
,3
]}

Phillips, W. D. ^{[1
,2
,3
]}

机构：

[1] Natl Inst Stand & Technol, Atom Phys Div, Gaithersburg, MD 20899 USA

[2] NIST, Joint Quantum Inst, College Pk, MD 20742 USA

[3] Univ Maryland, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 26期

关键词：

CRITICAL VELOCITY; SUPERFLUID; VORTEX; GASES;

D O I：

10.1103/PhysRevLett.99.260401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have observed the persistent flow of Bose-condensed atoms in a toroidal trap. The flow persists without decay for up to 10 s, limited only by experimental factors such as drift and trap lifetime. The quantized rotation was initiated by transferring one unit h of the orbital angular momentum from Laguerre-Gaussian photons to each atom. Stable flow was only possible when the trap was multiply connected, and was observed with a Bose-Einstein condensate fraction as small as 20%. We also created flow with two units of angular momentum and observed its splitting into two singly charged vortices when the trap geometry was changed from multiply to simply connected.

引用

页数：4

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