General Formula for the Thermoelectric Transport Phenomena based on the Fermi Liquid Theory: Thermopower, Nernst Coefficient, and Thermal Conductivity

Abstract

On the basis of the linear response transport theory, the general expressions for the thermoelectric transport coefficients, such as thermoelectric power (S), Nernst coefficient (ν), and thermal conductivity (κ), are derived by using the Fermi liquid theory. The obtained expression is exact as for the most singular term in terms of 1/γ_k^* (γ_k^* being the quasiparticle damping rate). We utilize the Ward identities for the heat current which is derived by the local energy conservation law. Based on the derived expressions, we can calculate various thermoelectric transport coefficients within the framework of the Baym-Kadanoff type conserving approximation. Thus, the present expressions are very useful for studying the strongly correlated electrons such as high-Tc superconductors, organic metals, and heavy Fermion systems, where the current vertex corrections are expected to play important roles. By using the derived expression, we calculate the thermal conductivity κin a free-dispersion model up to the second-order with respect to U. We find that it is slightly enhanced due to the vertex correction for the heat current, although the vertex correction for electron current makes the conductivity (σ) of this system diverge, reflecting the absence of the Umklapp process.

22 pages, 11 figures; accepted for publication in PRB

References in corpus (2)

• Theory of Thermoelectric Power in High-Tc Superconductors
• Theory of Electric Transport in the Pseudogap State of High-Tc Cuprates

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