Artigo
Nonlinear Schrodinger equation for a superfluid Fermi gas in the BCS-BEC crossover
Fecha
2008-04-01Registro en:
Physical Review A. College Pk: Amer Physical Soc, v. 77, n. 4, p. 4, 2008.
1050-2947
10.1103/PhysRevA.77.045602
WOS:000255457100203
WOS000255457100203.pdf
8031087349809439
Autor
Universidade Estadual Paulista (Unesp)
Resumen
We introduce a quasianalytic nonlinear Schrodinger equation with beyond mean-field corrections to describe the dynamics of a zero-temperature dilute superfluid Fermi gas in the crossover from the weak-coupling Bardeen-Cooper-Schrieffer (BCS) regime, where k(F)parallel to a parallel to << 1 with a the s-wave scattering length and k(F) the Fermi momentum, through the unitarity limit k(F)a ->+/-infinity to the Bose-Einstein condensation (BEC) regime where k(F)a > 0. The energy of our model is parametrized using the known asymptotic behavior in the BCS, BEC, and the unitarity limits and is in excellent agreement with accurate Green's-function Monte Carlo calculations. The model generates good results for frequencies of collective breathing oscillations of a trapped Fermi superfluid.