Slave-Boson Functional-Integral Approach to the Hubbard Model with Orbital Degeneracy
Abstract
A slave-boson functional-integral method has been developed for the Hubbard model with arbitrary, orbital degeneracy . Its saddle-point mean-field theory is equivalent to the Gutzwiller approximation, as in the case of single-band Hubbard model. Our theory is applied to the doubly degenerate () model, and numerical calculations have been performed for this model in the paramagnetic states. The effect of the exchange interaction on the metal-insulator (MI) transition is discussed. The critical interaction for the MI transition is analytically calculated as functions of orbital degeneracy and electron occupancy.
Keywords
Cite
@article{arxiv.cond-mat/9612142,
title = {Slave-Boson Functional-Integral Approach to the Hubbard Model with Orbital Degeneracy},
author = {Hideo Hasegawa},
journal= {arXiv preprint arXiv:cond-mat/9612142},
year = {2009}
}
Comments
Latex 20 pages, 9 figures available on request to [email protected] Note: published in J. Physical Society of Japan with some minor modifications