Probing semiclassical magneto-oscillations in the low-field quantum Hall effect

Details Probing semiclassical magneto-oscillations in the low-field quantum Hall effect Probing semiclassical magneto-oscillations in the low-field quantum Hall effect

2009-04-18

arxiv.org/abs/0904.2854v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

14 pages, 6 figures

Scientific paper

The low-field quantum Hall effect is investigated on a two-dimensional electron system in an AlGaAs/GaAs heterostructure. Magneto-oscillations following the semiclassical Shubnikov-de Haas formula are observed even when the emergence of the mobility gap shows the importance of quantum localization effects. Moreover, the Lifshitz-Kosevich formula can survive as the oscillating amplitude becomes large enough for the deviation to the Dingle factor. The crossover from the semiclassical transport to the description of quantum diffusion is discussed. From our study, the difference between the mobility and cyclotron gaps indicates that some electron states away from the Landau-band tails can be responsible for the semiclassical behaviors under low-field Landau quantization.

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