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Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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Title:
Thermodynamics of a Modified Fermi-Hubbard Model
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Uncontrolled Keywords:
Fermi-Hubbard model ; recurrence-relation ansatz ; modified Fermi-Hubbard model ; grand canonical ensemble ; phase transition
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Abstract:
A recently introduced recurrence-relation ansatz applied to the Fermi-Hubbard model gives rise to a soluble model and here is used to calculate several thermodynamic observables. The constraint of unit density per site, = 1, is applied and some of the results are compared to cases where the constraint is not imposed. The modified model exhibits a continuous phase transition (second order) reminiscent of the integer quantum Hall resistance and a ground state, first-order phase transition.