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We calculate the diffusion thermoelectric power of high-Tc cuprates using theresonating-valence-bond spin-liquid model developed by Yang, Rice and Zhang(YRZ). In this model, reconstruction of the energy-momentum dispersion resultsin a pseudogap in the density of states that is heavily asymmetric about theFermi level. The subsequent asymmetry in the spectral conductivity is found toaccount for the large magnitude and temperature dependence of the thermopowerobserved in underdoped cuprates. In addition we find evidence in experimentaldata for electron pockets in the Fermi surface, arising from a YRZ-likereconstruction, near the onset of the pseudogap in the slightly overdopedregime.

Electron pockets and pseudogap asymmetry observed in the thermopower of underdoped cuprates