Exact properties of the chemical potential-density relation at finite temperature in the Hubbard model
Sze-Shiang Feng, Ferdinando Mancini
Abstract
We draw some rigorous conclusions about the functional properties of the μ-ρ relation in the Hubbard model based on symmetry considerations and unitary transformations. It is shown that the charge susceptibility reaches its local extreme at half-filling. Exact expressions are obtained in two limiting cases.
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