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T=0 phase diagram of the 1D Hubbard model with magnetic interactions in the narrow band limit (Articolo in rivista)

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T=0 phase diagram of the 1D Hubbard model with magnetic interactions in the narrow band limit (Articolo in rivista) (literal)

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Ferdinando Mancini 1,2, Evgeny Plekhanov1,2,3, Gerardo Sica1 (2012)
T=0 phase diagram of the 1D Hubbard model with magnetic interactions in the narrow band limit
in Central European Journal of Physics (Print)
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1. Dipartimento di Fisica \"E.R. Caianiello\", Università degli Studi di Salerno, I-84084, Fisciano (SA), Italy 2. Unità CNISM di Salerno, Università degli Studi di Salerno, I-84084, Fisciano (SA), Italy 3. CNR-SPIN, UoS di Salerno, I-84084, Fisciano (SA), Italy (literal)

Titolo

T=0 phase diagram of the 1D Hubbard model with magnetic interactions in the narrow band limit (literal)

Abstract

In this paper we study a generalization of the Hubbard model by considering spin-spin interactions described by the exchange constant J. An external magnetic field his also taken into account. In the narrowband limit and for the 1D case, we present the exact solution obtained in the framework of the Green's function formalism, using the Composite Operator Method. We report the T = 0 phase diagram for both ferro (J > 0) and anti-ferro (J < 0) couplings. The competition of the different energy scales (U, J, and h; being U the local charge interaction) generates a variety of phases and different charge and spin orderings. (literal)

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