Multiband Tight-Binding Model of Local Magnetism in Ga1-xMnxAs
نویسندگان
چکیده
منابع مشابه
Multiband tight-binding model of local magnetism in Ga1-xMnxAs.
We present the spin and orbitally resolved local density of states (LDOS) for a single Mn impurity and for two nearby Mn impurities in GaAs. The GaAs host is described by a sp(3) tight-binding Hamiltonian, and the Mn impurity is described by a local p-d hybridization and on-site potential. Local spin-polarized resonances within the valence bands significantly enhance the LDOS near the band edge...
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We consider the electronic properties of ferromagnetic bulk Ga1−xMnxAs at zero temperature using two realistic tight-binding models, one due to Tang and Flatté and one due to Mašek. In particular, we study the density of states, the Fermi energy, the inverse participation ratio, and the optical conductivity with varying impurity concentration x=0.01–0.15. The results are very sensitive to the a...
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K. Aryanpour,1,3 J. Moreno,2,3 M. Jarrell,3 and R. S. Fishman4 1Department of Physics, University of California, Davis, California 95616, USA 2Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA 3Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA 4Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tenne...
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We report the observation of negative magnetoresistance in the ferromagnetic semiconductor Ga1−xMnxAs, x=0.05–0.08, at low temperatures T 3 K and low magnetic fields 0 B 20 mT . We attribute this effect to weak localization. Observation of weak localization strongly suggests impurity band transport in these materials, since for valence band transport one expects either weak antilocalization due...
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We use a simple tight-binding model to study the magnetism of twodimensional quantum dot lattices with 1 to 12 electrons per dot. The results show that in the middle of an electron shell the lattice favours antiferromagnetism while with nearly empty or full shells ferromagnetism is favoured. The size of the antiferromagnetic region increases with the coordination number of the dot. A one-dimens...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2004
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.92.047201