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Observation of the Presuperfluid Regime in a Two-Dimensional Bose Gas Public Deposited

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https://scholar.colorado.edu/concern/articles/k643b174j
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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Date Issued
  • 2010-12-03
Academic Affiliation
Journal Title
Journal Issue/Number
  • 23
Journal Volume
  • 105
File Extent
  • 230408-1-230408-4
Last Modified
  • 2019-12-05
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DOI
  • 10.1103/PhysRevLett.105.230408
ISSN
  • 0031-9007
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