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The β-expansion of the D=1 fermionic spinless Hubbard model off the half-filling regime

The β-expansion of the D=1 fermionic spinless Hubbard model off the half-filling regime

We obtain that when the spinless model is off the half-filling regime (μ ≠ V), the Helmholtz free energy (HFE) can be written as two β-expansions: one expansion comes from the half-filling configuration and another one that depends on the parameter x = μ - V. We show numerically that the chemical po...

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Bibliographic Details
Main Authors: Correa Silva, E.V., Thomaz, M.T., Rojas, O.
Format: Article
Language:English
Published: Інститут фізики конденсованих систем НАН України 2015
Series:Condensed Matter Physics
Online Access:http://dspace.nbuv.gov.ua/handle/123456789/154206
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Summary:We obtain that when the spinless model is off the half-filling regime (μ ≠ V), the Helmholtz free energy (HFE) can be written as two β-expansions: one expansion comes from the half-filling configuration and another one that depends on the parameter x = μ - V. We show numerically that the chemical potential as a function of temperature satisfies a relation similar to one derived from the particle-hole symmetry of the fermionic spinless model. We extend the β-expansion of the HFE of the one-dimensional fermionic spinless Hubbard model up to order β⁸.

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