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2013 | 11 | 1 | 119-123
Tytuł artykułu

Ferromagnetism in the two-dimensional Hubbard model with long-range hopping

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The combination of small-cluster exact-diagonalization calculations and the quantum Monte Carlo method is used to examine ferromagnetism in the two-dimensional Hubbard model with a generalized type of hopping. It is found that the long-range hopping with exponentially decaying hopping amplitudes t ij ∼ − q Ri−Rj stabilizes the ferromagnetic state for a wide range of electron interactions U and electron concentrations n > 1. The critical value of the hopping parameter q c above which the ferromagnetic state becomes stable is calculated numerically and the ground-state phase diagram of the model is discussed for physically the most interesting cases.
Wydawca

Czasopismo
Rocznik
Tom
11
Numer
1
Strony
119-123
Opis fizyczny
Daty
wydano
2013-01-01
online
2013-01-15
Twórcy
  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53, Košice, Slovakia
  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53, Košice, Slovakia
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-012-0135-7
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