Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-03-19
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 4 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.65.235327
We present longitudinal and Hall magneto-resistance measurements of a ``magnetic'' two-dimensional electron gas (2DEG) formed in modulation-doped Zn$_{1-x-y}$Cd$_{x}$Mn$_{y}$Se 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 as Landau levels cross near the Fermi level.
Awschalom David D.
Harris Jack G. E.
Knobel Rolt
Samarth Nitin
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