Exact Results of Strongly Correlated Systems at Finite Temperature
Sze-Shiang Feng
Abstract
Some rigorous conclusions of the Hubbard model, Kondo lattice model and periodic Anderson model at finite temperature are acquired employing the fluctuation-dissipation theorem and particle-hole transform. The main conclusion states that for the three models, the expectation value of S2- S2z will be of order NΛ at any finite temperature.
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