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

研究成果: Article同行評審

65 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)12830-12833
頁數4
期刊Physical Review B
46
發行號19
DOIs
出版狀態Published - 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

指紋 深入研究「Giant negative magnetoresistance of a degenerate two-dimensional electron gas in the variable-range-hopping regime」主題。共同形成了獨特的指紋。

引用此