Two Theorems on Pseudo-spin in the Hubbard Model

Details Two Theorems on Pseudo-spin in the Hubbard Model Two Theorems on Pseudo-spin in the Hubbard Model

1999-11-11

arxiv.org/abs/cond-mat/9911163v1

Physics Letters A266 (2000):193.

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, LATEX, no figures

Scientific paper

10.1016/S0375-9601(00)00042-6

An inequality of the eigenvalues of the reduced density matrix $\rho_2$ at
finite temperature in the Hubbard model is obtained by means of the Bogolyubov
inequality. The quasi-average of $\tilde{S}^{+}$ in a simple symmetry-breaking
perturbation of the Hamiltonian for a bipartite lattice is shown to be zero.

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