New insulating phases of two-dimensional electrons in high Landau levels: observation of sharp thresholds to conduction

Details New insulating phases of two-dimensional electrons in high Landau levels: observation of sharp thresholds to conduction New insulating phases of two-dimensional electrons in high Landau levels: observation of sharp thresholds to conduction

1999-07-23

arxiv.org/abs/cond-mat/9907374v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.60.R11285

The intriguing re-entrant integer quantized Hall states recently discovered in high Landau levels of high-mobility 2D electron systems are found to exhibit extremely non-linear transport. At small currents these states reflect insulating behavior of the electrons in the uppermost Landau level. At larger currents, however, a discontinuous and hysteretic transition to a conducting state is observed. These phenomena, found only in very narrow magnetic field ranges, are suggestive of the depinning of a charge density wave state, but other explanations can also be constructed.

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