Abstract
The authors discuss the role of partial particle-hole symmetry in calculations of thermopower. The authors resolve the apparent conflict between the work of Krempasky and Schmid and Vilenkin and Taylor regarding the potential cancellation of the Hasegawa terms (which arise from phonon renormalisation of the scattering vertex) in terms of whether or not particle-hole symmetry is assumed. For real crystals, diagrams of even order such as those representing the Hasegawa terms cannot be ignored.
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