Quantum magnetotransport in periodic V-grooved heterojunctions - art. no. 153315

We report quantum magnetotransport experiments in novel 3-mum-period V-groo ved GaAs/AlGaAs heterojunctions. In such structures a periodic spatial vari ation of the normal component of magnetic field is realized. We observe ano malous features in both weak and strong magnetic fields. The quantum Hall-e ffect steplike Hall resistance is replaced by an oscillatory variation when the current is applied parallel to the grooves. The longitudinal resistanc e peaks attain unusually high values much greater thanh/e(2) when the curre nt is applied perpendicular to the grooves. We propose a model that explain s certain features of the observed behavior, however, some puzzling anomali es remain.