Publicação: Linear to quadratic crossover of Cooper-pair dispersion relation
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Elsevier B.V.
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Cooper pairing is studied in three dimensions to determine its binding energy for all coupling using a general separable interfermion interaction. Also considered are Cooper pairs (CPs) with nonzero center-of-mass momentum (CMM). A coupling-independent linear term in the CMM dominates the pair excitation energy in weak coupling and/or high fermion density, while the more familiar quadratic term prevails only in the extreme low-density (i.e., vacuum) limit for any nonzero coupling. The linear-to-quadratic crossover of the CP dispersion relation is analyzed numerically, and is expected to play a central role in a model of superconductivity (and superfluidity) simultaneously accommodating a Bardeen-Cooper-Schrieffer condensate as well as a Bose-Einstein condensate of CP bosons. (C) 2001 Elsevier B.V. B,V. All rights reserved.
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Cooper pairs, Bose-Einstein condensation, exotic superconductivity, superfluidity
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Inglês
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Physica C. Amsterdam: Elsevier B.V., v. 351, n. 4, p. 341-348, 2001.
