%0 Journal Article
%T Anti-Levitation in the Integer Quantum Hall Systems
%A C. Wang
%A Y. Avishai
%A Y. Meir
%A X. R. Wang
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.89.045314
%X Two-dimensional electron gas in the integer quantum Hall regime is investigated numerically by studying the dynamics of an electron hopping on a square lattice subject to a perpendicular magnetic field and random on-site energy with white noise distribution. Focusing on the lowest Landau band we establish an anti-levitation scenario of the extended states: As either the disorder strength $W$ increases or the magnetic field strength $B$ decreases, the energies of the extended states move below the Landau energies pertaining to a clean system. Moreover, for strong enough disorder, there is a disorder dependent critical magnetic field $B_c(W)$ below which there are no extended states at all. A general phase diagram in the $W-1/B$ plane is suggested with a line separating domains of localized and delocalized states.
%U http://arxiv.org/abs/1307.7532v4