Document Type

Article

Publication Date

Winter 12-3-2010

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

105

Issue

23

First Page

230408-1

Last Page

230408-4

DOI

10.1103/PhysRevLett.105.230408

Abstract

In complementary images of coordinate-space and momentum-space density in a trapped 2D Bose gas, we observe the emergence of presuperfluid behavior. As phase-space density ρ increases toward degenerate values, we observe a gradual divergence of the compressibility κ from the value predicted by a bare-atom model, κba. κ/κba grows to 1.7 before ρ reaches the value for which we observe the sudden emergence of a spike at p=0 in momentum space. Momentum-space images are acquired by means of a 2D focusing technique. Our data represent the first observation of non-mean-field physics in the presuperfluid but degenerate 2D Bose gas.

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