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Thermoelectric power in one-dimensional Hubbard model

M. M. Zemljic·P. Prelovsek
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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 $ω$ 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.

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M. M. Zemljic, P. Prelovsek. 2004-07-09. Thermoelectric power in one-dimensional Hubbard model. https://doi.org/10.1103/physrevb.71.085110

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