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23 April 2024

» arxiv » cond-mat/0606243

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A 'Wheel' and 'Axle' description of the Bogoliubov-Anderson phonon in the BEC/BCS crossover
Da-Shin Lee ; Chi-Yong Lin ; Ray J. Rivers ;
Date:	9 Jun 2006
Subject:	Other
Abstract:	We show that the properties of the gapless mode of the BEC/BCS crossover in the presence of a Feshbach resonance at T=0 can be derived easily from the derivative expansion of the exact (one-loop) effective action. In particular, from a simple ’wheel’ and ’axle’ phonon action, we calculate the sound velocity, both analytically and numerically, throughout the BCS and BEC regimes.
Source:	arXiv, cond-mat/0606243
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