Interacting Electrons on a Square Fermi Surface
摘要
Electronic states near a square Fermi surface are mapped onto quantum chains. Using boson-fermion duality on the chains, the bosonic part of the interaction is isolated and diagonalized. These interactions destroy Fermi liquid behavior. Non-boson interactions are also generated by this mapping, and give rise to a new perturbation theory about the boson problem. A case with strong repulsions between parallel faces is studied and solved. There is spin-charge separation and the square Fermi surface remains square under doping. At half-filling, there is a charge gap and insulating behavior together with gapless spin excitations. This mapping appears to be a general tool for understanding the properties of interacting electrons on a square Fermi surface.
引用
@article{arxiv.cond-mat/9405046,
title = {Interacting Electrons on a Square Fermi Surface},
author = {A. Luther},
journal= {arXiv preprint arXiv:cond-mat/9405046},
year = {2009}
}
备注
25 pages, Nordita preprint 94/22 S