Magnetotransport in a two-dimensional electron system in dc electric fields

TL;DR

This study investigates nonequilibrium magnetotransport in high-mobility two-dimensional electron systems under weak magnetic fields and dc excitation, revealing new resonant behaviors and resistance reduction phenomena.

Contribution

It uncovers a novel resonant condition in dc-induced magneto-oscillations and demonstrates the similarity between dc-driven and microwave-driven transport phenomena.

Findings

Identification of a new resonant condition in dc-induced magneto-oscillations

Observation of significant resistance reduction by weak dc fields

Implications for microwave-induced zero-resistance state suppression

Abstract

We report on nonequilibrium transport measurements in a high-mobility two-dimensional electron system subject to weak magnetic field and dc excitation. Detailed study of dc-induced magneto-oscillations, first observed by Yang {\em et al}., reveals a resonant condition that is qualitatively different from that reported earlier. In addition, we observe dramatic reduction of resistance induced by a weak dc field in the regime of separated Landau levels. These results demonstrate similarity of transport phenomena in dc-driven and microwave-driven systems and have important implications for ongoing experimental search for predicted quenching of microwave-induced zero-resistance states by a dc current.