Document Type

Article

Publication Date

Fall 9-2-2002

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

89

Issue

10

First Page

100403-1

Last Page

100403-4

DOI

10.1103/PhysRevLett.89.100403

Abstract

We have studied the dynamics of large vortex lattices in a dilute-gas Bose-Einstein condensate. While undisturbed lattices have a regular hexagonal structure, large-amplitude quadrupolar shape oscillations of the condensate are shown to induce a wealth of nonequilibrium lattice dynamics. When exciting an m=−2 mode, we observe shifting of lattice planes, changes of lattice structure, and sheetlike structures in which individual vortices appear to have merged. Excitation of an m=+2 mode dissolves the regular lattice, leading to randomly arranged but still strictly parallel vortex lines.

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