Otro
Linear to quadratic crossover of Cooper-pair dispersion relation
Registro en:
Physica C. Amsterdam: Elsevier B.V., v. 351, n. 4, p. 341-348, 2001.
0921-4534
10.1016/S0921-4534(00)01638-5
WOS:000168008300003
Autor
Adhikari, S. K.
Casas, M.
Puente, A.
Rigo, A.
Fortes, M.
Solis, M. A.
de Llano, M.
Valladares, A. A.
Rojo, O.
Resumen
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.