External control of a metal-insulator transition in GaMnAs wires.
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.
Nguyen
Anh Kiet
AK
Department of Physics, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway.
Brataas
Arne
A