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

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

2010-09-13

arxiv.org/abs/1009.2475v2

Phys. Rev. Lett. 105, 230408 (2010)

Physics

Condensed Matter

Quantum Gases

Replace with the version appeared in PRL

Scientific paper

In complementary images of coordinate-space and momentum-space density in a trapped 2D Bose gas, we observe the emergence of pre-superfluid behavior. As phase-space density $\rho$ increases toward degenerate values, we observe a gradual divergence of the compressibility $\kappa$ from the value predicted by a bare-atom model, $\kappa_{ba}$. $\kappa/\kappa_{ba}$ grows to 1.7 before $\rho$ 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-meanfield physics in the pre-superfluid but degenerate 2D Bose gas.

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