Pinning mode resonance of a Skyrme crystal near Landau level filling factor $\nu$=1

TL;DR

This study investigates microwave pinning-mode resonances near Landau level filling factor =1, revealing spin-dependent effects consistent with a Skyrme crystal, especially at lower quasiparticle densities.

Contribution

It provides experimental evidence linking spin effects to Skyrme crystal formation near =1 in quantum Hall systems.

Findings

Pinning frequencies increase near =1 with in-plane magnetic field.

Resonance behavior is consistent with a Skyrme crystal model.

Spin influences charge dynamics in quantum Hall crystals.

Abstract

Microwave pinning-mode resonances found around integer quantum Hall effects, are a signature of crystallized quasiparticles or holes. Application of in-plane magnetic field to these crystals, increasing the Zeeman energy, has negligible effect on the resonances just below Landau level filling $\nu=2$, but increases the pinning frequencies near $\nu=1$, particularly for smaller quasiparticle/hole densities. The charge dynamics near $\nu=1$, characteristic of a crystal order, are affected by spin, in a manner consistent with a Skyrme crystal.