KIP publications

year 2006
author(s) R. Gati, B. Hemmerling, J. Fölling, M. Albiez and M.K. Oberthaler
title Noise Thermometry with Two Weakly Coupled Bose-Einstein Condensates
KIP-Nummer HD-KIP 06-66
KIP-Gruppe(n) F17,F20
document type Paper
Keywords (shown) Noise Thermometry Two Weakly Coupled Bose-Einstein Condensates
source Physical Review Letters 96 (2006) 130404 , arXiv:cond-mat/0601392
doi 10.1103/PhysRevLett.96.130404
Abstract (en)

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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