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      Spin filtering in a quantum ring with Rashba coupling

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      Author
      Tanatar, Bilal
      Moldoveanu V.
      Date
      2010
      Source Title
      2010 3rd International Nanoelectronics Conference (INEC)
      Publisher
      IEEE
      Pages
      583 - 584
      Language
      English
      Type
      Conference Paper
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      Abstract
      We study the effect of Rashba spin-orbit coupling on the spin interference in a non-interacting one-dimensional ring connected to two lead theoretically within the non-equilibrium Greens' function formalism. We compute the charge and spin currents and analyze their Aharonov-Bohm oscillations. The geometry of the system is conveniently described by the angle δ between the two leads. We show that for δ=180° (i.e for symmetrically coupled leads) a good tutering of up or down spin orientation is obtained around half-integer multiples of Φ/Φ0. These particular flux values correspond to degeneracy points for clockwise and counter-clockwise propagating state related to the same spin orientation in the local spin frame of the ring. In contrast, for the asymmetric coupling, i.e., δ=135° the filter efficiency is maximum around integer multiples of Φ/Φ0. The numerical results suggest that the spin filtering is obtained when the clockwise or counter-clockwise states interfere destructively. The spin filtering regime is stable against variations of the bias applied on the system. ©2010 IEEE.
      Keywords
      Asymmetric coupling
      Counter-clockwise
      Degeneracy point
      Filter efficiency
      Local spin
      Non equilibrium
      Numerical results
      Quantum ring
      Rashba coupling
      Rashba spin-orbit coupling
      Spin currents
      Spin filtering
      Spin interference
      Spin orientations
      Nanoelectronics
      Numerical analysis
      Spin dynamics
      Permalink
      http://hdl.handle.net/11693/28584
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/INEC.2010.5425177
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      • Department of Physics 2299
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