CURRENT DISTRIBUTION IN THE INTEGER QUANTUM HALL-EFFECT - THE ROLE OFBULK STATES

The role of bulk and edge currents in a two-dimensional electron gas u nder the conditions of the integer quantum Hall effect (IQHE) was stud ied by means of an inductive coupling to Hall bar geometry. From this study we conclude that the extended states at the bulk of the sample b elow the Fermi energy are capable of carrying a substantial amount of Hall current. For Hall bar geometry sample with a back gate we demonst rated that injected current can be pushed from one edge to another by reversing the direction of the external magnetic field. (C) 1997 Acade mic Press Limited.