QUENCHING OF NONLOCAL ELECTRON-TRANSPORT IN TILTED MAGNETIC-FIELDS

A variety of transport phenomena observed at laterally confined two- d imensional electron systems (2DES) prove the occurrence of non-local c ontributions to the electronic conductance in these systems. However, this non-local regime accompanied by a non-equilibrium population of t he edge states with respect to the 2D bulk state is quenched at rather low values of current-driving electric fields. We analyse the non-Ohm ic behaviour of SdH oscillations at GaAs/GaAlAs Quantum Hall conductor s on the basis of a model including edge and bulk conduction and deduc e the non-equilibrium population of edge and bulk states quantitativel y.The spatial separation between edge and bulk states was changed by t ilting the samples with respect to the magnetic field. The resulting a ngular dependences of equilibration parameters could be quantitatively explained by the change of the ratio of spin splitting to cyclotron e nergy being present in 2DES in tilted magnetic fields.