Collective modes and superconductivity in an extended Hubbard model for copper oxide superconductors

1990 ◽  
Vol 42 (16) ◽  
pp. 10075-10089 ◽  
Author(s):  
P. B. Littlewood
Keyword(s):  
Copper Oxide ◽  
Hubbard Model ◽  
Collective Modes ◽  
Oxide Superconductors ◽  
Extended Hubbard Model ◽  
Copper Oxide Superconductors

SINGLE-PARTICLE AND OPTICAL EXCITATIONS IN DOPED MOTT- HUBBARD INSULATORS

1992 ◽  
Vol 06 (05n06) ◽  
pp. 589-602 ◽  
Author(s):  
WALTER STEPHAN ◽  
PETER HORSCH
Keyword(s):  
Optical Properties ◽  
Band Structure ◽  
Fermi Surface ◽  
Copper Oxide ◽  
Hubbard Model ◽  
Optical Conductivity ◽  
Single Particle ◽  
Oxide Superconductors ◽  
Two Dimensional ◽  
Copper Oxide Superconductors

Recent numerical results for the single-particle spectral function and optical conductivity of the two-dimensional Hubbard and t−J models are reviewed. Already for two holes in systems of sixteen to twenty sites (≥ 10% doping) a large electronic Fermi surface, compatible with Luttinger’s theorem, is observed. The full single-particle Green’s function is examined, and is shown to exhibit quasiparticle-like behavior, with dispersion consistent with the band structure of the non-interacting limit, and band width scaling approximately as J for J smaller than t. The optical conductivity of the Hubbard and t−J models is shown to have many features in common with recent experiments on copper oxide superconductors. The importance of the often neglected 3-site terms which arise in the derivation of the t−J model from the Hubbard model for optical properties is discussed.

Correlation in Metallic Copper Oxide Superconductors: How Large is it?

1990 ◽  
pp. 463-473
Author(s):  
W. E. Pickett ◽  
H. Krakauer ◽  
R. E. Cohen ◽  
D. Singh ◽  
D. A. Papaconstantopoulos
Keyword(s):  
Copper Oxide ◽  
Metallic Copper ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors
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