The Mesoscopic Quantum-Hall-Insulator Transition

Details The Mesoscopic Quantum-Hall-Insulator Transition The Mesoscopic Quantum-Hall-Insulator Transition

2003-07-02

arxiv.org/abs/cond-mat/0307044v3

JETP Letters vol. 80, issue 4, page 316-320 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

Sharp localization transitions of chiral edge states in disordered quantum wires, subject to strong magnetic field, are shown to be driven by crossovers from two- to one-dimensional localization of bulk states. As a result, the two-terminal conductance is found to exhibit at zero temperature discontinuous transitions between {\it exactly} integer plateau values and zero, reminiscent of first order phase transitions. We discuss the corresponding phase diagram. The spin of the electrons is shown to result in a multitude of phases, when the spin degeneracy is lifted by the Zeeman energy. The width of conductance plateaus is found to depend sensitively on the spin flip rate $1/\tau_s$.

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