INTERLAYER SURFACE TRANSPORT IN MULTILAYER QUANTUM HALL SYSTEMS UNDER TILTED MAGNETIC FIELDS

Abstract

We have studied interlayer surface transport in multilayer quantum Hall systems under tilted magnetic fields. Under the fields normal to layers, edge state of each layer couples with each other due to interlayer tunneling forming the chiral surface state, which causes the surface transport. Once the field is tilted to the normal of the surface, the inter-edge tunneling is suppressed except at the certain magic angles. On the other hands, when the field is tilted in the surface, the inter-edge tunneling reflects the density distribution of the edge state. We carried out the experiments to confirm these features using GaAs/AlGaAs superlattices.