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Spin filtering and spin accumulation in an electron stub waveguide with spin-orbit interaction

Zhai, Feng LU and Xu, Hongqi LU (2007) In Physical Review B (Condensed Matter and Materials Physics) 76(3).
Abstract
We investigate spin-dependent transport properties of a two-terminal electron waveguide, attached with a side arm, with Rashba spin-orbit interaction (SOI). The interference between the bound states in the side arm and the continuous states in the straight channel gives rise to broad valleys in the conductance spectrum. At these Fano antiresonances, a large transverse spin polarization can be created by the SOI-induced effective magnetic field. The magnitude of the spin polarization in this waveguide structure can be electrically tuned by variation of the stub length or the SOI strength, suggesting that the SOI-modulated stub waveguide structure can be used as an electrically tunable spin filter. It is also found that highly polarized... (More)
We investigate spin-dependent transport properties of a two-terminal electron waveguide, attached with a side arm, with Rashba spin-orbit interaction (SOI). The interference between the bound states in the side arm and the continuous states in the straight channel gives rise to broad valleys in the conductance spectrum. At these Fano antiresonances, a large transverse spin polarization can be created by the SOI-induced effective magnetic field. The magnitude of the spin polarization in this waveguide structure can be electrically tuned by variation of the stub length or the SOI strength, suggesting that the SOI-modulated stub waveguide structure can be used as an electrically tunable spin filter. It is also found that highly polarized spin-density islands can form inside the stub. Thus the stub waveguide structure could also be utilized to create local magnetic moments and for information storage. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
76
issue
3
publisher
American Physical Society
external identifiers
  • wos:000248500800081
  • scopus:34447124482
ISSN
1098-0121
DOI
10.1103/PhysRevB.76.035306
language
English
LU publication?
yes
id
52d345d1-9a8e-475a-939d-8070d891ad86 (old id 691355)
date added to LUP
2007-12-19 11:23:00
date last changed
2017-08-20 04:28:17
@article{52d345d1-9a8e-475a-939d-8070d891ad86,
  abstract     = {We investigate spin-dependent transport properties of a two-terminal electron waveguide, attached with a side arm, with Rashba spin-orbit interaction (SOI). The interference between the bound states in the side arm and the continuous states in the straight channel gives rise to broad valleys in the conductance spectrum. At these Fano antiresonances, a large transverse spin polarization can be created by the SOI-induced effective magnetic field. The magnitude of the spin polarization in this waveguide structure can be electrically tuned by variation of the stub length or the SOI strength, suggesting that the SOI-modulated stub waveguide structure can be used as an electrically tunable spin filter. It is also found that highly polarized spin-density islands can form inside the stub. Thus the stub waveguide structure could also be utilized to create local magnetic moments and for information storage.},
  articleno    = {035306},
  author       = {Zhai, Feng and Xu, Hongqi},
  issn         = {1098-0121},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Spin filtering and spin accumulation in an electron stub waveguide with spin-orbit interaction},
  url          = {http://dx.doi.org/10.1103/PhysRevB.76.035306},
  volume       = {76},
  year         = {2007},
}