Asymmetric non-linear response of the IQHE

Abstract

An asymmetric break-down of the integer quantized Hall effect is investigated. This rectification effect is observed as a function of the current value and its direction in conjunction with an asymmetric lateral confinement potential defining the Hall-bar. Our electrostatic definition of the Hall-bar via Schottky-gates allows a systematic control of the steepness of the confinement potential at the edges of the Hall-bar. A softer edge (flatter confinement potential) results in more stable Hall-plateaus, i.e. a break-down at a larger current density. For one soft and one hard edge the break-down current depends on the current direction, resembling rectification. This non-linear magneto-transport effect confirms the predictions of an emerging screening theory of the IQHE.

4 Pages, 4 Figures

References in corpus (7)

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• Field effect induced mesoscopic devices in depleted two dimensional electron systems
• The visibility of IQHE at sharp edges: Experimental proposals based on interactions and edge electrostatics
• Transition from edge- to bulk-currents in the quantum Hall regime
• The Dip Effect under Integer Quantized Hall Conditions
• Nature of current flow in the regime of the quantum Hall effect
• Current density distribution for the quantum Hall effect