Measurements of Landau-level crossings and extended states in magnetic two-dimensional electron gases

R. Knobel, N. Samarth, J. G.E. Harris, D. D. Awschalom

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We present longitudinal and Hall magnetoresistance measurements of a "magnetic" two-dimensional electron gas formed in modulation-doped Zn1-x-yCdxMnySe quantum wells. The electron spin splitting is temperature and magnetic field dependent, resulting in striking features as Landau levels of opposite spin cross near the Fermi level. Magnetization/measurements on the same sample probe the total density of states and Fermi energy, allowing us to fit the transport data using a model involving extended states centered at each Landau level and two-channel conduction for spin-up and spin-down electrons. A mapping of the extended states over the whole quantum Hall effect regime shows no floating of extended states within experimental resolution as Landau levels cross near the Fermi level.

Original languageEnglish (US)
Article number235327
Pages (from-to)2353271-2353278
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number23
StatePublished - Jun 15 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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