Volume 66, Number 6, June 2004
|Page(s)||826 - 832|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 June 2004|
Quantum beating in ring conductance: Observation of spin chiral states and Berry's phase
Naval Research Laboratory - Washington, DC 20375, USA
2 Department of Electrical and Computer Engineering University of Maryland - College Park, MD 20742, USA
Accepted: 15 April 2004
We propose and demonstrate experimentally a novel configuration for observing spin interference effects in mesoscopic rings. Using this configuration, in which the conducting ring and the tangential current lead form a single collimating contact, we have observed the spin quantum beating in the Aharonov-Bohm conductance oscillations. We demonstrate that the beating is the result of the superposition of two independent interference signals associated with two orthogonal states arising from intrinsic spin-orbit interactions. Our work demonstrates the signature of the spin Berry phase in the conductance of quantum rings.
PACS: 73.63.Nm – Quantum wires / 73.23.Ad – Ballistic transport / 73.40.Kp – III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
© EDP Sciences, 2004
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