Observation of narrow-band noise accompanying the breakdown of insulating states in high Landau levels

TL;DR

This paper reports the observation of narrow- and broad-band noise during the breakdown of insulating states in high Landau levels, revealing complex dynamics linked to the applied current in two-dimensional electron systems.

Contribution

It provides new experimental evidence of noise phenomena associated with the breakdown of re-entrant integer quantum Hall states in high Landau levels.

Findings

Narrow- and broad-band noise observed during state breakdown

Noise frequencies depend strongly on applied dc current

Transitions occur sharply at certain threshold fields

Abstract

Recent magnetotransport experiments on high mobility two-dimensional electron systems have revealed many-body electron states unique to high Landau levels. Among these are re-entrant integer quantum Hall states which undergo sharp transitions to conduction above some threshold field. Here we report that these transitions are often accompanied by narrow- and broad-band noise with frequencies which are strongly dependent on the magnitude of the applied dc current.