Effective size of a trapped atomic Bose gas
Wenxian Zhang, Z. Xu, and L. You
TL;DR
This paper studies how the effective size of a trapped atomic Bose gas changes with temperature, showing that a sudden shrinkage indicates Bose-Einstein condensation and can be used for nondestructive temperature calibration.
Contribution
It demonstrates that the observed size reduction is a reliable indicator of BEC and supports using the gas's average width for temperature measurement in experiments.
Findings
Size shrinks suddenly at BEC transition
Size measurement can calibrate temperature nondestructively
Supports mean field theory for size analysis
Abstract
We investigate the temperature-dependent effective size of a trapped interacting atomic Bose gas within a mean field theory approximation. The sudden shrinking of the average length, as observed in an earlier experiment by Wang {\it et al.} [Chin. Phys. Lett. {\bf 20}, 799 (2003)], is shown to be a good indication for Bose-Einstein condensation (BEC). Our study also supports the use of the average width of a trapped Bose gas for a nondestructive calibration of its temperature.
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