CROSSOVER FROM BCS TO BOSE SUPERCONDUCTIVITY - A FUNCTIONAL INTEGRAL APPROACH

被引：2

作者：

RANDERIA, M ^{[1
]}

DEMELO, CARS ^{[1
]}

ENGELBRECHT, JR ^{[1
]}

机构：

[1] UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801

来源：

PHYSICA B | 1994年 / 194卷

关键词：

D O I：

10.1016/0921-4526(94)91204-1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We use a functional integral formulation to study the crossover from cooperative Cooper pairing to the formation and condensation of tightly bound pairs in a 3D continuum model of fermions with attractive interactions. The inadequacy of a saddle point approximation with increasing coupling is pointed out, and the importance of temporal (quantum) fluctuations for normal state properties at intermediate and strong coupling is emphasized. In addition to recovering the Nozieres-Schmitt-Rink interpolation scheme for T(c), and the Leggett variational results for T = 0, we also present results for evolution of the time-dependent Ginzburg-Landau equation and collective mode spectrum as a function of the coupling.

引用

页码：1409 / 1410

页数：2

共 7 条

[1]

DEMELO CAR, UNPUB

[2]

DRECHSLER M, 1992, ANN PHYS-LEIPZIG, V1, P15, DOI 10.1002/andp.19925040105

[3]

Leggett A. J., 1980, MODERN TRENDS THEORY

[4] BOSE CONDENSATION IN AN ATTRACTIVE FERMION GAS - FROM WEAK TO STRONG COUPLING SUPERCONDUCTIVITY [J].