Giant magnetoresistance and quantum phase transitions in strongly localized magnetic two-dimensional electron gases

I. Smorchkova, N. Samarth, J. Kikkawa, D. Awschalom

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

The application of a small magnetic field (Formula presented) either parallel or perpendicular to a low-density (Formula presented) magnetic two-dimensional electron gas (2DEG) creates a striking positive magnetoresistance of up to 700%. This is a spin effect, caused by the suppression of spin-dependent hopping paths between localized states with on-site correlation. At higher fields, a spin-related delocalization is observed. In the perpendicular field geometry, orbital effects combine with this delocalization and lead to quantum phase transitions between the spin-polarized insulating state and the (Formula presented) quantum Hall liquid.

Original languageEnglish (US)
Pages (from-to)R4238-R4241
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number8
DOIs
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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