Thermoelectric power in one-dimensional Hubbard model

Abstract

The thermoelectric power S is studied within the one-dimensional Hubbard model using the linear response theory and the numerical exact-diagonalization method for small systems. While both the diagonal and off-diagonal dynamical correlation functions of particle and energy current are singular within the model even at temperature T>0, S behaves regularly as a function of frequency $\omega$ and T. Dependence on the electron density n below the half-filling reveals a change of sign of S at n_0=0.73+/-0.07 due to strong correlations, in the whole T range considered. Approaching half-filling S is hole-like and can become large for U>>t although decreasing with T.

6 pages, 4 figures

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• Thermomagnetic Power and Figure of Merit for Spin-1/2 Heisenberg Chain
• Validity of the Wiedemann-Franz law in small molecular wires
• From thermal rectifiers to thermoelectric devices
• Dynamical thermal response functions for strongly correlated one-dimensional systems
• Fundamental aspects of steady state heat to work conversion
• Thermopower in transition-metal perovskites
• Energy and particle currents in a driven integrable system
• Thermoelectric Power in the Double Exchange Model