Metal-insulator transitions at surfaces
Abstract
Various types of metal-insulator transitions are discussed to find conditions for which an ideal surface of a bulk insulator is metallic. It is argued that for the correlation-driven Mott metal-insulator transition the surface phase diagram should be expected to have the same topology as the phase diagram for magnetic order at surfaces: The corresponding linearized mean-field descriptions, a simplified dynamical mean-field theory of the Hubbard model and the Weiss mean-field theory for the Ising model, are found to be formally equivalent. A new kind of surface state appears in the low-energy part of the one-particle excitation spectrum as a precursor effect of the Mott transition.
Cite
@article{arxiv.cond-mat/0204135,
title = {Metal-insulator transitions at surfaces},
author = {M. Potthoff},
journal= {arXiv preprint arXiv:cond-mat/0204135},
year = {2007}
}
Comments
11 pages, 4 eps figures included, Adv. Solid State Phys. (in press)