Electron Localization in the Insulating State
材料科学
2009-10-31 v2 强关联电子
摘要
The insulating state of matter is characterized by the excitation spectrum, but also by qualitative features of the electronic ground state. The insulating ground wavefunction in fact: (i) sustains macroscopic polarization, and (ii) is localized. We give a sharp definition of the latter concept, and we show how the two basic features stem from essentially the same formalism. Our approach to localization is exemplified by means of a two--band Hubbard model in one dimension. In the noninteracting limit the wavefunction localization is measured by the spread of the Wannier orbitals.
引用
@article{arxiv.cond-mat/9808151,
title = {Electron Localization in the Insulating State},
author = {R. Resta and S. Sorella},
journal= {arXiv preprint arXiv:cond-mat/9808151},
year = {2009}
}
备注
5 pages including 3 figures, submitted to PRL