Spin- and valley-dependent transport through arrays of ferromagnetic silicene junctions

N. Missault, P. Vasilopoulos, V. Vargiamidis, F. M. Peeters, and B. Van Duppen
Phys. Rev. B 92, 195423 – Published 20 November 2015

Abstract

We study ballistic transport of Dirac fermions in silicene through arrays of barriers, of width d, in the presence of an exchange field M and a tunable potential of height U or depth U. The spin- and valley-resolved conductances as functions of U or M, exhibit resonances away from the Dirac point (DP) and close to it a pronounced dip that becomes a gap when a critical electric field Ez is applied. This gap widens by increasing the number of barriers and can be used to realize electric field-controlled switching of the current. The spin ps and valley pv polarizations of the current near the DP increase with Ez or M and can reach 100% for certain of their values. These field ranges widen significantly by increasing the number of barriers. Also, ps and pv oscillate nearly periodically with the separation between barriers or wells and can be inverted by reversing M.

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  • Received 13 September 2015
  • Revised 27 October 2015

DOI:https://doi.org/10.1103/PhysRevB.92.195423

©2015 American Physical Society

Authors & Affiliations

N. Missault1, P. Vasilopoulos2,*, V. Vargiamidis2,†, F. M. Peeters1,‡, and B. Van Duppen1,§

  • 1Departement Fysica, Universiteit Antwerpen Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
  • 2Department of Physics, Concordia University, Montreal, Quebec H3G 1M8, Canada

  • *p.vasilopoulos@concordia.ca
  • vasileios.vargiamidis@concordia.ca
  • francois.peeters@uantwerpen.be
  • §ben.vanduppen@uantwerpen.be

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Issue

Vol. 92, Iss. 19 — 15 November 2015

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