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arXiv · 0911.4832

Asymmetric non-linear response of the IQHE

A. Siddiki·J. Horas·D. Kupidura·W. Wegscheider·S. Ludwig
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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.

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A. Siddiki, J. Horas, D. Kupidura, W. Wegscheider, S. Ludwig. 2009-11-25. Asymmetric non-linear response of the IQHE. https://doi.org/10.1088/1367-2630%2F12%2F11%2F113011

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