Thermoelectric Power of the Narrow-Band Hubbard Chain at Arbitrary Electron Density: Atomic Limit.

摘要

We study the thermoelectric power of a narrow-band Hubbard chain with an arbitrary number of electrons per site. The calculations are carried out to the lowest order in the transfer integral. We find a characteristic electron density (rho = 2/3) below which the thermoelectric power is negative at all temperatures. In contrast, for rho > 2/3, the thermoelectric power is small and negative only above a characteristic temperature, below which there is a change of sign and slope. We comment on the applicability of these results to the charge-transfer salts of tetracyanoquinodimethan (TCNQ). (Author)