Fizika Nizkikh Temperatur: Volume 43, Number 8 (August 2017), p. 1236-1242    ( to contents , go back )

Giant oscillations of the current in a dirty 2D electron system flowing perpendicular to a lateral barrier under magnetic field

A.M. Kadigrobov

Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany
E-mail: kadig@tp3.rub.de

Received February 8, 2017

Abstract

The charge transport in a dirty 2-dimensional electron system biased in the presence of a lateral potential barrier under magnetic field is theoretically studied. The quantum tunnelling across the barrier provides the quantum interference of the edge states localized on its both sides that results in giant oscillations of the charge current flowing perpendicular to the lateral junction. Our theoretical analysis is in a good agreement with the experimental observations presented in W. Kang et al., Lett. Nature 403, 59 (2000). In particular, positions of the conductance maxima coincide with the Landau levels while the conductance itself is essentially suppressed even at the energies at which the resonant tunnelling occurs and hence these puzzling observations can be resolved without taking into account the electron-electron interaction.

PACS: 75.47.–m Magnetotransport phenomena; materials for magnetotransport;
PACS: 03.65.Ge Solutions of wave equations: bound states;
PACS: 05.60.Gg Quantum transport;
PACS: 75.45.+j Macroscopic quantum phenomena in magnetic systems.

Key words: giant oscillations, magnetic field, electron-electron interaction.

Published online: June 26, 2017

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