Non-monotonic temperature dependence of thermopower in strongly correlated electron systems

摘要

We examine the temperature dependence of thermopower in the single bandHubbard model using dynamical mean-field theory. The strong Coulomb interactionbrings about the coherent-to-incoherent crossover as temperature increases. Asa result, the thermopower exhibits non-monotonic temperature dependence andasymptotically approaches values given by the Mott-Heikes formula. In the lightof our theoretical result, we discuss the thermopower in some transition metaloxides. The magnetic field dependence of the thermopower is also discussed.