Rashba Spin-Orbit Interaction and Shot Noise for Spin-Polarized and Entangled Electrons

J. Carlos Egues, Guido Burkard, and Daniel Loss
Phys. Rev. Lett. 89, 176401 – Published 4 October 2002

Abstract

We study shot noise for spin-polarized currents and entangled electron pairs in a four-probe (beam-splitter) geometry with a local Rashba spin-orbit (so) interaction in the incoming leads. Within the scattering formalism we find that shot noise exhibits Rashba-induced oscillations with continuous bunching and antibunching. We show that entangled states and triplet states can be identified via their Rashba phase in noise measurements. For two-channel leads, we find an additional spin rotation due to so induced interband coupling which enhances spin control. We show that the so interaction determines the Fano factor, which provides a direct way to measure the Rashba coupling constant via noise.

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  • Received 1 May 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.176401

©2002 American Physical Society

Authors & Affiliations

J. Carlos Egues*, Guido Burkard, and Daniel Loss

  • Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

  • *Permanent address: Department of Physics and Informatics, University of São Paulo at São Carlos, 13560-970 São Carlos, SP, Brazil.

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Issue

Vol. 89, Iss. 17 — 21 October 2002

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