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External control of a metal-insulator transition in GaMnAs wires
Anh Kiet Nguyen1, Arne Brataas
1Department of Physics, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway.
Abstract:
Quantum transport in disordered ferromagnetic (III,Mn)V semiconductors is studied theoretically. Mesoscopic wires exhibit an Anderson disorder-induced metal-insulator transition that can be controlled by a weak external magnetic field. This metal-insulator transition should also occur in other materials with large anisotropic magnetoresistance effects. The transition can be useful for studies of zero-temperature quantum critical phase transitions and fundamental material properties.
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