2001/03/19 by R. Knobel, N. Samarth, Nitin Samarth +2
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.65.235327
10 pages, 4 figures, submitted to Phys. Rev. B
arxiv created 2001/03/19 · openalex publication_date 2002/06/20 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present longitudinal and Hall magnetoresistance measurements of a ``magnetic'' two-dimensional electron gas formed in modulation-doped Zn_1\ensuremath-x\ensuremath-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.