A Primary Noise Thermometer for Ultracold Bose Gases

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dc.creatorGati, R.
dc.creatorEsteve, J.
dc.creatorHemmerling, B.
dc.creatorOttenstein, T. B.
dc.creatorAppmeier, J.
dc.creatorWeller, A.
dc.creatorOberthaler, M. K.
dc.date2006-06-12
dc.date2006-09-13
dc.date.accessioned2026-07-07T07:12:35Z
dc.date.available2026-07-07T07:12:35Z
dc.descriptionWe discuss in detail the experimental investigation of thermally induced fluctuations of the relative phase between two weakly coupled Bose-Einstein condensates. In analogy to superconducting Josephson junctions, the weak coupling originates from a tunneling process through a potential barrier which is obtained by trapping the condensates in an optical double-well potential. The observed fluctuations of the relative phase are in quantitative agreement with a many body two mode model at finite temperature. The agreement demonstrates the possibility of using the phase fluctuation measurements in a bosonic Josephson junction as a primary thermometer. This new method allows for measuring temperatures far below the critical temperature where standard methods based on time of flight measurements fail. We employ this new thermometer to probe the heat capacity of a degenerate Bose gas as a function of temperature.
dc.description19 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0606281
dc.identifierhttp://arxiv.org/abs/cond-mat/0606281
dc.identifierdoi:10.1088/1367-2630/8/9/189
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112124
dc.subjectOther Condensed Matter
dc.titleA Primary Noise Thermometer for Ultracold Bose Gases
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