Ferromagnetism in the asymmetric Hubbard model

P. Farkašovský

The European Physical Journal B: Condensed Matter and Complex Systems, 2012, vol. 85, issue 8, 1-4

Abstract: The density matrix renormalization group and quantum Monte Carlo calculations are used to study ferromagnetism in the one- and two-dimensional asymmetric Hubbard model. The model is examined for a wide range of electron concentrations n, Coulomb interactions U and down-spin electron hopping integrals t ↓ changing from t ↓ = 0 (the case of the Falicov-Kimball model) to t ↓ = 1 (the case of the conventional Hubbard model). The critical value of the down-spin electron hopping integral t ↓ c below which the ferromagnetic state becomes stable is calculated numerically and the ground-state phase diagram of the model (in the t ↓ -U plane) is presented for physically the most interesting cases (n = 1 / 4,1 / 2 and 3/4). It is shown that at fixed U the ferromagnetic state is stabilized with increasing concentration of holes (1 − n) in the system, and at fixed n the ferromagnetic state is generally stabilized with increasing U. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1140/epjb/e2012-30306-9

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