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Quantum Joule-Thomson Effect in a Saturated Homogeneous Bose Gas

arXiv
Authors: Tobias F. Schmidutz, Igor Gotlibovych, Alexander L. Gaunt, Robert P. Smith, Nir Navon, Zoran Hadzibabic

Year

2013

Paper ID

32872

Status

Preprint

Abstract Read

~2 min

Abstract Words

104

Citations

N/A

Abstract

We study the thermodynamics of Bose-Einstein condensation in a weakly interacting quasi-homogeneous atomic gas, prepared in an optical-box trap. We characterise the critical point for condensation and observe saturation of the thermal component in a partially condensed cloud, in agreement with Einstein's textbook picture of a purely statistical phase transition. Finally, we observe the quantum Joule-Thomson effect, namely isoenthalpic cooling of an (essentially) ideal gas. In our experiments this cooling occurs spontaneously, due to energy-independent collisions with the background gas in the vacuum chamber. We extract a Joule-Thomson coefficient μrm JT > 109 K/bar, about ten orders of magnitude larger than observed in classical gases.

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  • We study the thermodynamics of Bose-Einstein condensation in a weakly interacting quasi-homogeneous atomic gas, prepared in an optical-box trap.

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