Noise Thermometry with Two Weakly Coupled Bose-Einstein Condensates

Details Noise Thermometry with Two Weakly Coupled Bose-Einstein Condensates Noise Thermometry with Two Weakly Coupled Bose-Einstein Condensates

2006-01-17

arxiv.org/abs/cond-mat/0601392v2

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.130404

Here we report on the experimental investigation of thermally induced fluctuations of the relative phase between two Bose-Einstein condensates which are coupled via tunneling. The experimental control over the coupling strength and the temperature of the thermal background allows for the quantitative analysis of the phase fluctuations. Furthermore, we demonstrate the application of these measurements for thermometry in a regime where standard methods fail. With this we confirm that the heat capacity of an ideal Bose gas deviates from that of a classical gas as predicted by the third law of thermodynamics.

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