1997 Volume 66 Issue 11 Pages 3577-3590
Electrical conductivity σ (ω, T)of a lattice electron system due only to mutual Coulomb interaction is studied on the basis of the Fermi liquid theory, ω and T being the external frequency and the temperature, respectively. Based on the Kubo formula to respect the consistency between the selfenergyand the vertex corrections, a formulation of σ (ω, T)is given in terms of memory function which is extended to the matrix form.In this formulation, it is explicitly demonstrated that, in the absence of Umklapp processes, T2-term in the resistivity vanishesas it should in spite of the fact that the total current is not conserved.
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