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
收藏
页码:5087 / 5090
页数:4
相关论文
共 22 条
  • [1] Bedell K, 1990, HIGH TEMPERATURE SUP
  • [2] POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM
    BEDNORZ, JG
    MULLER, KA
    [J]. 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
    COTE, R
    GRIFFIN, A
    [J]. PHYSICAL REVIEW B, 1988, 37 (09): : 4539 - 4551
  • [5] COLLECTIVE MODES IN LAYERED SUPERCONDUCTORS
    FERTIG, HA
    DASSARMA, S
    [J]. PHYSICAL REVIEW LETTERS, 1990, 65 (12) : 1482 - 1485
  • [6] Fetter A, 2003, QUANTUM THEORY MANY
  • [7] CORRECTION
    FOLDY, LL
    [J]. 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