Quantum Beating in Ring Conductance: Observation of Spin Chiral States and Berry's phase

TL;DR

This paper reports the observation of spin quantum beating in quantum ring conductance, demonstrating the influence of spin chiral states and Berry's phase through interference patterns caused by spin-orbit interactions.

Contribution

It provides conclusive experimental evidence of spin Berry's phase in quantum rings, linking spin chiral states to conductance oscillations.

Findings

Observation of spin quantum beating in conductance oscillations

Identification of superposition of interference patterns from spin chiral states

Evidence of spin Berry's phase in quantum ring conductance

Abstract

Using singly connected rings with a collimating contact to current leads, we have observed the spin quantum beating in the Aharonov-Bohm conductance oscillations. We demonstrate that the beating is a result of the superposition of two independent interference patterns associated with two orthogonal spin chiral states arising from intrinsic spin-orbit interactions. Our work provides the conclusive evidence of the spin Berry's phase in the conductance of quantum rings.