Investigation of on-site inter-orbital single electron hoppings in general multi-orbital systems
Abstract
A general multi-orbital Hubbard model, which includes on-site inter-orbital electron hoppings, is introduced and studied. It is shown that the on-site inter-orbital single electron hopping is one of the most basic interactions. Two electron spin-flip and pair-hoppings are shown to be correlation effects of higher order than the on-site inter-orbital single hopping. It is shown how the double and higher hopping interactions can be well-defined for arbitrary systems. The two-orbital Hubbard model is studied numerically to demonstrate the influence of the single electron hopping effect, leading to a change of the shape of the bands and a shrinking of the difference between the two bands. Inclusion of the on-site inter-orbital hopping suppresses the so-called orbital-selective Mott transition.
Keywords
Cite
@article{arxiv.1110.4045,
title = {Investigation of on-site inter-orbital single electron hoppings in general multi-orbital systems},
author = {Qingguo Feng and Peter M. Oppeneer},
journal= {arXiv preprint arXiv:1110.4045},
year = {2012}
}
Comments
5 pages, 3 figures