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Effective theory of excitations in a Feshbach resonant superfluid | | W. Vincent Liu
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5 Aug 2005 | | Subject: | Other; Superconductivity | cond-mat.other cond-mat.supr-con | | Affiliation: | Pittsburgh | | Abstract: | A strongly interacting Fermi gas, such as that of cold atoms operative near a Feshbach resonance, is difficult to study by perturbative many-body theory to go beyond mean field approximation. Here I develop an effective field theory for the resonant superfluid based on broken symmetry. The theory retains both fermionic quasiparticles and superfluid phonons, the interaction between them being derived non-perturbatively. The theory converges and can be improved order by order, in a manner governed by a low energy expansion rather than by coupling constant. I apply the effective theory to calculate the specific heat and propose a mechanism of understanding the empirical power law of energy versus temperature recently measured in a heat capacity experiment. | | Source: | arXiv, cond-mat/0508139 | | Services: | Forum | Review | PDF | Favorites | |
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