Document Type

Article

Publication Date

Winter 1-30-2004

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

92

Issue

4

First Page

040404-1

Last Page

040404-4

DOI

10.1103/PhysRevLett.92.040404

Abstract

We create rapidly rotating Bose-Einstein condensates in the lowest Landau level by spinning up the condensates to rotation rates Ω > 99% of the centrifugal limit for a harmonically trapped gas, while reducing the number of atoms. As a consequence, the chemical potential drops below the cyclotron energy 2ℏΩ. While in this mean-field quantum-Hall regime we still observe an ordered vortex lattice, its elastic shear strength is strongly reduced, as evidenced by the observed very low frequency of Tkachenko modes. Furthermore, the gas approaches the quasi-two-dimensional limit. The associated crossover from interacting- to ideal-gas behavior along the rotation axis results in a shift of the axial breathing mode frequency.

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