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

• Authors: Pavol Farkašovský , Hana Čenčariková
• Languages of publication: EN

Abstracts

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.

Keywords

EN

strongly correlated electrons; Hubbard model; band ferromagnetism

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2013
• Volume: 11
• Issue: 1
• Pages: 119-123

Dates

published

1 - 1 - 2013

online

15 - 1 - 2013

Contributors

author

Pavol Farkašovský

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53, Košice, Slovakia

author

Hana Čenčariková

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53, Košice, Slovakia

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Identifiers

DOI

10.2478/s11534-012-0135-7