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VOLUME 62 (1995) | ISSUE 6 | PAGE 511
Anomalies in the spectra of quantum oscillations for dilute two-dimensional electronic systems
Magnetotransport characteristics of a two-dimensional hole gas located at a Si/SiGe heterojunction are measured for two carrier concentrations. A notable discrepancy is observed between values of the magnetic level filling factor determined from the periodicity of the Shubnikov-de Haas oscillations and the values of the Hall conductivity expected at these filling factors. In particular, the sample of lower concentration exhibits a re-entrant transition between the quantum Hall effect state and insulating state. It is shown that all the observed effects can be described by a model [S. I. Dorozhkin, JETP Lett. 60, 595 (1994)] which takes into account the long-range potential modulation in the sample, with amplitude comparable to the Fermi energy. © 1995 American Institute of Physics.