TRANSPORT-PROPERTIES OF QUANTUM WIRES IN SPATIALLY PERIODIC MAGNETIC AND ELECTROSTATIC FIELDS

Electron transport properties of quantum wires in the presence of modu lated magnetic and electrostatic fields are investigated. We find dips in conductance just below each mode threshold in the presence of a pe riodic magnetic modulation. The combination of both electrostatic and magnetic modulations makes the conductance dips more pronounced. The e ffects of temperature and background magnetic field on the conductance dips are also studied. Increasing the number of periods of magnetic m odulation can lead to magnetic blocking and reopening of the channel, as the field strength is increased. For higher incoming energy, a larg er value of the magnetic modulation amplitude is needed to block the c hannel and to reopen it. For thicker magnetic barriers, the range of f ield strength for magnetic reopening narrows. Electrostatic modulation suppresses the magnetic reopening.