COLLECTIVE EXCITATIONS AND THE CROSSOVER FROM COOPER PAIRS TO COMPOSITE BOSONS IN THE ATTRACTIVE HUBBARD-MODEL

被引：43

作者：

BELKHIR, L ^{[1
]}

RANDERIA, M ^{[1
]}

机构：

[1] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.45.5087

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Motivated by the short coherence length of the high-temperature superconductors, we study in the negative-U Hubbard model the crossover from Cooper pairs for U << t to composite bosons for U >> t. We compute the collective-mode spectrum using a generalized random-phase-approximation analysis within the equations-of-motion formalism. We find a smooth evolution of the Anderson mode for weak coupling into the Bogoliubov sound mode for hard-core bosons.

引用

页码：5087 / 5090

页数：4

共 22 条

[1]

Bedell K, 1990, HIGH TEMPERATURE SUP

[2] POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM [J].

BEDNORZ, JG ;

MULLER, KA .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1986, 64 (02) :189-193

[3]

BELKHIR L, UNPUB

[4] EXCITONIC MODES IN A BOSE-CONDENSED ELECTRON-HOLE GAS IN THE PAIRING APPROXIMATION [J].

COTE, R ;

GRIFFIN, A .

PHYSICAL REVIEW B, 1988, 37 (09) :4539-4551

[5] COLLECTIVE MODES IN LAYERED SUPERCONDUCTORS [J].

FERTIG, HA ;

DASSARMA, S .

PHYSICAL REVIEW LETTERS, 1990, 65 (12) :1482-1485

[6]

Fetter A, 2003, QUANTUM THEORY MANY

[7] CORRECTION [J].

FOLDY, LL .

PHYSICAL REVIEW, 1962, 125 (06) :2208-&

[8]

Gyorffy B. L., UNPUB

[9]

Leggett A. J., 1980, MODERN TRENDS THEORY

[10]

MARTIN PC, 1969, SUPERCONDUCTIVITY, V1, P371

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