Magnetic-Field-Induced Enhancement of Electronic Conduction in Weakly Coupled Supperlattices
磁场引起弱耦合超晶格中隧穿电流的增加

We apply a magnetic field B along the axis of an n-type doped weakly-coupled GaAs/AlAs superlattice(SL)to investigate the carrier transport in a low electric field.An abnormal enhancement of the current intensity by perpendicular B is observed for the ground state transport.Electron tunneling or hopping conduction via elastic scattering at low B switches over into resonant tunneling at higher B because in the latter case the electrons only partially occupy the first Landau level.