| Numéro |
J. Phys. I France
Volume 5, Numéro 4, April 1995
|
|
|---|---|---|
| Page(s) | 455 - 464 | |
| DOI | https://doi.org/10.1051/jp1:1995139 | |
DOI: 10.1051/jp1:1995139
J. Phys. I France 5 (1995) 455-464Density of States in the
W. Fettes, I. Morgenstern, T. Hußlein, H.-G. Matuttis, J.M. Singer and C. Baur
Universität Regensburg, Fakultät Physik, 93040 Regensburg, Germany
© Les Editions de Physique 1995
J. Phys. I France 5 (1995) 455-464
Density of States in the
-Hubbard Model: Exact Diagonalisation Results
W. Fettes, I. Morgenstern, T. Hußlein, H.-G. Matuttis, J.M. Singer and C. Baur Universität Regensburg, Fakultät Physik, 93040 Regensburg, Germany
(Received 18 November 1994, received in final form 5 December 1994, accepted 14 December 1994)
Abstract
We calculated the density of states in a Hubbard model with nearest and next nearest neighbour
hopping. Using an exact diagonalisation technique, we examined this model in a wide area of
parameters. The density of states was calculated for different fillings and for positive and
negative interaction
U. The additional hopping to the next nearest neighbour sites has different
effects on the gap between the particle and hole spectrum compared to the pure Hubbard model.
© Les Editions de Physique 1995