Huge Longitudinal Resistance in the Fractional Quantum Hall Effect Regime

TL;DR

This paper reports unusually large and sharp longitudinal resistance maxima in a quantum well within the fractional quantum Hall regime, indicating complex domain formation and nuclear spin interactions.

Contribution

It reveals a novel resistance behavior at specific filling factors, suggesting new insights into electronic state domains and nuclear spin effects in quantum Hall systems.

Findings

Large resistance maxima at 2/3 and 3/5 filling factors

Maxima formation occurs over long time scales

Evidence of domain formation and nuclear spin involvement

Abstract

The magneto resistance of a narrow single quantum well is spectacularly different from the usual behavior. At filling factors 2/3 and 3/5 we observe large and sharp maxima in the longitudinal resistance instead of the expected minima. The peak value of the resistance exceeds those of the surrounding magnetic field regions by a factor of up to three. The formation of the maxima takes place on very large time scales which suggests a close relation with nuclear spins. We discuss the properties of the observed maxima due to a formation of domains of different electronic states.