Temperature dependence of thermopower in strongly correlated multiorbital systems

Sekino, Mari*; Okamoto, Satoshi*; Koshibae, Wataru*; Mori, Michiyasu  ; Maekawa, Sadamichi

Temperature dependence of thermopower in the multiorbital Hubbard model is studied by using the dynamical mean-field theory with the non-crossing approximation impurity solver. It is found that the Coulomb interaction, the Hund coupling, and the crystal filed splitting bring about non-monotonic temperature dependence of the thermopower, including its sign reversal. The implication of our theoretical results to some materials is discussed.