Quantum-Hall to insulator transition

Details Quantum-Hall to insulator transition Quantum-Hall to insulator transition

1998-08-18

arxiv.org/abs/cond-mat/9808190v1

Physica B 256-258 (1998) 591-594

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages LaTeX2e, 5 ps-figures included. Proceedings SemiMag13, Nijmegen 1998; to appear in Physica B

Scientific paper

10.1016/S0921-4526(98)00551-1

The crossover from the quantum Hall regime to the Hall-insulator is investigated by varying the strength of the diagonal disorder in a 2d tight-binding model. The Hall and longitudinal conductivities and the behavior of the critical states are calculated numerically. We find that with increasing disorder the current carrying states close to the band center disappear first. Simultaneously, the quantized Hall conductivity drops monotonically to zero also from higher quantized values.

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