Evidence for the Collective Nature of the Reentrant Integer Quantum Hall States of the Second Landau Level

TL;DR

This paper presents evidence that Coulomb interactions are crucial for the formation of reentrant integer quantum Hall states in the second Landau level, based on temperature-dependent magnetoresistance measurements.

Contribution

It provides the first direct evidence linking Coulomb interactions to the collective nature of reentrant quantum Hall states in the second Landau level.

Findings

Sharp peak in magnetoresistance defines onset temperature

Onset temperatures scale with Coulomb energy

Supports the collective interaction-based formation of these states

Abstract

We report an unexpected sharp peak in the temperature dependence of the magnetoresistance of the reentrant integer quantum Hall states in the second Landau level. This peak defines the onset temperature of these states. We find that in different spin branches the onset temperatures of the reentrant states scale with the Coulomb energy. This scaling provides direct evidence that Coulomb interactions play an important role in the formation of these reentrant states evincing their collective nature.