Ferromagnetism in the two-dimensional Hubbard model with long-range hopping |
| |
Authors: | Pavol Farkašovský Hana Čenčariková |
| |
Institution: | 1. Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53, Ko?ice, Slovakia
|
| |
Abstract: | 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: | |
本文献已被 SpringerLink 等数据库收录! |