Document Type

Article

Publication Date

Summer 7-17-2007

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

99

Issue

3

First Page

030401-1

Last Page

030401-4

DOI

10.1103/PhysRevLett.99.030401

Abstract

We observe the proliferation of vortices in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional array of Josephson-coupled Bose-Einstein condensates. As long as the Josephson (tunneling) energy J exceeds the thermal energy T, the array is vortex free. With decreasing J/T, vortices appear in the system in ever greater numbers. We confirm thermal activation as the vortex-formation mechanism and obtain information on the size of bound vortex pairs as J/T is varied.

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