Quantum beating in ring conductance: Observation of spin chiral states and Berry's phaseM. J. Yang1, C. H. Yang2 and Y. B. Lyanda-Geller1
1 Naval Research Laboratory - Washington, DC 20375, USA
2 Department of Electrical and Computer Engineering University of Maryland - College Park, MD 20742, USA
(Received 29 October 2003; accepted in final form 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.
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