Magnetic Field Inducing Zeeman Splitting and Anomalous Conductance Reduction of Half-integer Quantized Plateaus in InAs Quantum Wires

TL;DR

This study investigates how magnetic fields influence half-integer quantized conductance plateaus in InAs quantum wires, revealing Zeeman splitting and conductance reduction, with electron interactions possibly explaining these phenomena.

Contribution

It demonstrates magnetic field-induced Zeeman splitting of HQPs in InAs quantum wires and suggests electron-electron interactions as a key mechanism.

Findings

Zeeman splitting of HQPs under magnetic field

Gradual conductance decrease with increasing magnetic field

Zero-field HQPs possibly caused by electron-electron interactions

Abstract

We report on magnetic field dependence of half-integer quantized conductance plateaus (HQPs) in InAs quantum wires. We observed HQPs at zero applied magnetic field in InAs quantum wires fabricated from a high-quality InAs quantum well. The application of in-plane magnetic field causes Zeeman splitting of the HQP features, indicating that the origin of the observed HQP is not spontaneous spin polarization. Additionally we observe that conductance of the split HQPs decreases gradually as the in-plane magnetic field increases. We finally assume electron-electron interaction as a possible mechanism to account for the zero-field HQPs and the anomalous field dependence.