Anomalous Spin-Related Quantum Phase in Mesoscopic Hole Rings

TL;DR

This paper provides exact numerical analysis of spin-related quantum phases in mesoscopic p-type semiconductor rings, revealing enhanced sensitivity of magnetoconductance oscillations due to Rashba spin splitting and hole-spin state mixing, with implications for spin-interference devices.

Contribution

It offers the first numerically exact results on spin-related geometric phases in hole rings, highlighting the impact of Rashba spin splitting and quantum confinement on device sensitivity.

Findings

Magnetoconductance oscillations are highly sensitive to external parameters.

Rashba spin splitting significantly influences quantum phases.

Results suggest improved design for hole-ring spin-interference devices.

Abstract

We have obtained numerically exact results for the spin-related geometric quantum phases that arise in p-type semiconductor ring structures. The interplay between gate-controllable (Rashba) spin splitting and quantum-confinement-induced mixing between hole-spin states causes a much higher sensitivity of magnetoconductance oscillations to external parameters than previously expected. Our results imply a much-enhanced functionality of hole-ring spin-interference devices and shed new light on recent experimental findings.