Thermoelectric power in one-dimensional Hubbard model

Details Thermoelectric power in one-dimensional Hubbard model Thermoelectric power in one-dimensional Hubbard model

2004-07-09

arxiv.org/abs/cond-mat/0407251v1

Phys. Rev. B 71, 085110 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.085110

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.

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