Metal-Insulator transition in one-dimensional Hubbard superlattices
Strongly Correlated Electrons
2009-10-31 v1 Mesoscale and Nanoscale Physics
Statistical Mechanics
Abstract
We study the Metal-Insulator transition in one-dimensional Hubbard superlattices (SL's), modelled by a repeated pattern of repulsive (i.e., positive on-site coupling) and free sites. The evolution of the local moment and of the charge gap (calculated from Lanczos diagonalization of chains up to 18 sites), together with a strong coupling analysis, show that the electron density at which the system is insulating increases with the size of the free layer, relative to the repulsive one. In the insulating state, the mechanism of interaction between fermions separated by a free layer is the analog of superexchange, and the charge gap display universal features.
Keywords
Cite
@article{arxiv.cond-mat/9807302,
title = {Metal-Insulator transition in one-dimensional Hubbard superlattices},
author = {Thereza Paiva and Raimundo R. dos Santos},
journal= {arXiv preprint arXiv:cond-mat/9807302},
year = {2009}
}
Comments
4 pages, 3 colour figures; Phys Rev B 15 Sept (tent)