TITLE:
Spin-Flip Scattering at Quantum Hall Transition
AUTHORS:
Victor Kagalovsky, Alexander L. Chudnovskiy
KEYWORDS:
PACS 73.43.Nq, 72.25.Mk, 73.20.Jc
JOURNAL NAME:
Journal of Modern Physics,
Vol.2 No.9,
September
19,
2011
ABSTRACT: We formulate a generalized Chalker-Coddington network model that describes the effect of nuclear spins on the two-dimensional electron gas in the quantum Hall regime. We find exact analytical expression for spin-dependent transmission coefficients of a charged particle through a saddle point potential in a perpendicular magnetic field. Spin-flip scattering creates a metallic state in a finite range around the critical energy of quantum Hall transition. As a result we find that the usual insulating phases with Hall conductance σxy=0,1,2 are separated by novel metallic phases.