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For the thermoelectric properties of NaxCoO2, we analyze the effect of localCoulomb interaction and (disordered) potential differences for Co-sites withadjacent Na-ion or vacancy. The disorder potential alone increases theresistivity and reduces the thermopower, while the Coulomb interaction aloneleads only to minor changes compared to the one-particle picture of the localdensity approximation. Only combined, these two terms give rise to asubstantial increase of the thermopower: the number of (quasi-)electrons aroundthe Fermi level is much more suppressed than that of the (quasi-)holes. Hence,there is a particle-hole imbalance acting in the same direction as a similarimbalance for the group velocities. Together, this interplay results in a largepositive thermopower. Introducing a thermoelectric spectral density, we locatedthe energies and momenta regions most relevant for the thermopower and changesthereof.

Effects of electronic correlations and disorder on the thermopower of NaxCoO2