Electrical Conductivity and Thermodynamics of the Narrow-Half-Filled-Band Hubbard Model

1972 ◽  
Vol 6 (12) ◽  
pp. 4623-4628 ◽  
Author(s):  
Robert A. Bari ◽  
T. A. Kaplan
Keyword(s):  
Electrical Conductivity ◽  
Hubbard Model

Electrical Conductivity of the Two-Dimensional Half-Filled Hubbard Model

1994 ◽  
Vol 11 (1) ◽  
pp. 57-60 ◽  
Author(s):  
Feng Chen ◽  
Heping Ying ◽  
Tiefeng Xu ◽  
Wenzhu Li
Keyword(s):  
Electrical Conductivity ◽  
Hubbard Model ◽  
Two Dimensional

The electrical conductivity of an amorphous Hubbard model

1992 ◽  
Vol 70 (1) ◽  
pp. 24-30 ◽  
Author(s):  
K. L. Liu
Keyword(s):  
Electrical Conductivity ◽  
Correlation Function ◽  
Hubbard Model ◽  
Impurity Band ◽  
Current Correlation Function ◽  
Current Correlation ◽  
High Temperature Expansion ◽  
Different Temperatures ◽  
Seventh Order ◽  
Transfer Integral

We study the frequency-dependent electrical conductivity of a structurally disordered single-band Hubbard model near half-filling and in the strong-correlation limit. The electronic transfer integral is assumed to have a quasi-exponential form as used in the impurity-band problem of doped semiconductors. The short-time expansion of the current correlation function is calculated diagrammatically to the second order in the inverse temperature β and up to the seventh order in electronic hopping. Based on this expansion an approximate current correlation function is constructed. By means of the Kubo formula, the configurational average of the electrical conductivity is then calculated to order β2 for various atomic densities. The validity of the high-temperature expansion is examined. We also study the effect of spin polarization on the absorption line shape and the dc resistivity at different temperatures.

Sign in / Sign up

Export Citation Format

Share Document