Two Theorems on Pseudo-spin in the Hubbard Model
Sze-Shiang Feng
Abstract
An inequality of the eigenvalues of the reduced density matrix ρ2 at finite temperature in the Hubbard model is obtained by means of the Bogolyubov inequality. The quasi-average of S+ in a simple symmetry-breaking perturbation of the Hamiltonian for a bipartite lattice is shown to be zero.
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