Spin-current modulation and square-wave transmission through periodically stubbed electron waveguides

X. F. Wang, P. Vasilopoulos, and F. M. Peeters
Phys. Rev. B 65, 165217 – Published 16 April 2002
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Abstract

Ballistic spin transport through waveguides, with symmetric or asymmetric double stubs attached to them periodically, is studied systematically in the presence of a weak spin-orbit coupling that makes the electrons precess. By an appropriate choice of the waveguide length and of the stub parameters injected spin-polarized electrons can be blocked completely and the transmission shows a periodic and nearly-square-type behavior, with values 1 and 0, with wide gaps when only one mode is allowed to propagate in the waveguide. A similar behavior is possible for a certain range of the stub parameters even when two modes can propagate in the waveguide and the conductance is doubled. Such a structure is a good candidate for establishing a realistic spin transistor. A further modulation of the spin current can be achieved by inserting defects in a finite-number stub superlattice. Finite-temperature effects on the spin conductance are also considered.

  • Received 26 December 2001

DOI:https://doi.org/10.1103/PhysRevB.65.165217

©2002 American Physical Society

Authors & Affiliations

X. F. Wang1, P. Vasilopoulos1, and F. M. Peeters2

  • 1Concordia University, Department of Physics, 1455 de Maisonneuve Ouest, Montréal, Québec, H3G 1M8, Canada
  • 2Departement Natuurkunde, Universiteit Antwerpen (UIA), Universiteitsplein 1, B-2610, Antwerpen, Belgium

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Vol. 65, Iss. 16 — 15 April 2002

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