Giant negative magnetoresistance of a degenerate two-dimensional electron gas in the variable-range-hopping regime

H. W. Jiang, C. E. Johnson, K. L. Wang

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65 Citations (Scopus)

Abstract

We present an experimental study of magnetoresistance of a degenerate, two-dimensional electron gas with a broad range of localization length in the variable-range-hopping regime. At low magnetic fields, a giant negative magnetoresistance of R(0)/R(H)∼7 is observed and is confirmed to be an orbital mechanism in origin. At high fields, the two-dimensional electron gas shows a contrasting transport behavior of a positive magnetoresistance. We found the transition from negative to positive magnetoresistance is temperature independent and occurs at a magnetic field corresponding to the lowest Landau-level filling factor of ν=2. While we cannot reach a definite conclusion as to the origin of the giant negative magnetoresistance, our experimental data suggest the important role of the Landau-level quantization to the transport properties of a degenerate two-dimensional electron gas in the variable-range-hopping regime.

Original languageEnglish
Pages (from-to)12830-12833
Number of pages4
JournalPhysical Review B
Volume46
Issue number19
DOIs
Publication statusPublished - 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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