Three-dimensional disordered conductors in a strong magnetic field: surface states and quantum Hall plateaus

Abstract

We study localization in layered, three-dimensional conductors in strong magnetic fields. We demonstrate the existence of three phases - insulator, metal and quantized Hall conductor - in the two-dimensional parameter space obtained by varying the Fermi energy and the interlayer coupling strength. Transport in the quantized Hall conductor occurs via extended surface states. These surface states constitute a subsystem at a novel critical point, which we describe using a new, directed network model.

4 pages (PostScript) replaced due to compression error, slightly shortened version to appear in PRL

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