Spin filtering and entanglement detection due to spin-orbit interaction in carbon nanotube cross-junctions

Francesco Mazza, Bernd Braunecker, Patrik Recher, and Alfredo Levy Yeyati
Phys. Rev. B 88, 195403 – Published 7 November 2013

Abstract

We demonstrate that, due to their spin-orbit interaction, carbon nanotube cross-junctions have attractive spin projective properties for transport. First, we show that the junction can be used as a versatile spin filter as a function of a backgate and a static external magnetic field. Switching between opposite spin filter directions can be achieved by small changes of the backgate potential, and a full polarization is generically obtained in an energy range close to the Dirac points. Second, we discuss how the spin filtering properties affect the noise correlators of entangled electron pairs, which allows us to obtain signatures of the type of entanglement that are different from the signatures in conventional semiconductor cross-junctions.

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  • Received 30 July 2013

DOI:https://doi.org/10.1103/PhysRevB.88.195403

©2013 American Physical Society

Authors & Affiliations

Francesco Mazza1,2, Bernd Braunecker1, Patrik Recher3, and Alfredo Levy Yeyati1

  • 1Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC), and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
  • 2NEST, Scuola Normale Superiore, and Istituto Nanoscienze-CNR, I-56126 Pisa, Italy
  • 3Institute for Mathematical Physics, Technical University Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig, Germany

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Vol. 88, Iss. 19 — 15 November 2013

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