On the low-field insulator-quantum Hall conductor transitions

Details On the low-field insulator-quantum Hall conductor transitions On the low-field insulator-quantum Hall conductor transitions

2005-03-12

arxiv.org/abs/cond-mat/0503306v1

Physica E 22, 240-243 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Our experimental results are inconsistent with Huckestein's argument [PRL 84, 3141 (2000)]

Scientific paper

10.1016/j.physe.2003.11.258

We studied the insulator-quantum Hall conductor transition which separates the low-field insulator from the quantum Hall state of the filling factor $\nu=4$ on a gated two-dimensional GaAs electron system containing self-assembled InAs quantum dots. To enter the $\nu=4$ quantum Hall state directly from the low-field insulator, the two-dimensional system undergoes a crossover from the low-field localization to Landau quantization. The crossover, in fact, covers a wide range with respect to the magnetic field rather than only a small region near the critical point of the insulator-quantum Hall conductor transition.

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