Year: 2010
Type: article
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 $\ensuremath{\rho}$ increases toward degenerate values, we observe a gradual divergence of the compressibility $\ensuremath{\kappa}$ from the value predicted by a bare-atom model, ${\ensuremath{\kappa}}_{\mathrm{ba}}$. $\ensuremath{\kappa}/{\ensuremath{\kappa}}_{\mathrm{ba}}$ grows to 1.7 before $\ensuremath{\rho}$ 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-mean-field physics in the presuperfluid but degenerate 2D Bose gas.
Source: Physical Review Letters
Authors: S. Tung, G. Lamporesi, D. Lobser, L. Xia, E. A. Cornell
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2020831723