Spin filter due to spin Hall effect with axially asymmetric potential

Tomohiro Yokoyama; Mikio Eto

doi:10.1016/j.physe.2009.10.061

Spin filter due to spin Hall effect with axially asymmetric potential

Tomohiro Yokoyama, Mikio Eto

Department of Physics

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

We examine a three-terminal spin filter including an artificial potential created by antidot, scanning tunnel microscope (STM) tip, etc., fabricated on semiconductor heterostructures with strong spin-orbit interaction. When the potential is attractive and its strength is properly tuned, the resonant scattering takes place, which enhances the extrinsic spin Hall effect. As a result, the efficiency of the spin filter can be more than 50% when the potential is axially symmetric. The efficiency becomes smaller when the symmetry is broken, but we still expect an efficient spin filter unless the degree of asymmetry is too large.

Original language	English
Pages (from-to)	956-959
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	42
Issue number	4
DOIs	https://doi.org/10.1016/j.physe.2009.10.061
Publication status	Published - 2010 Feb 1

Keywords

Antidot
Resonant scattering
Spin Hall effect
Spin filter
Spin-orbit interaction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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Yokoyama, T., & Eto, M. (2010). Spin filter due to spin Hall effect with axially asymmetric potential. Physica E: Low-Dimensional Systems and Nanostructures, 42(4), 956-959. https://doi.org/10.1016/j.physe.2009.10.061

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AB - We examine a three-terminal spin filter including an artificial potential created by antidot, scanning tunnel microscope (STM) tip, etc., fabricated on semiconductor heterostructures with strong spin-orbit interaction. When the potential is attractive and its strength is properly tuned, the resonant scattering takes place, which enhances the extrinsic spin Hall effect. As a result, the efficiency of the spin filter can be more than 50% when the potential is axially symmetric. The efficiency becomes smaller when the symmetry is broken, but we still expect an efficient spin filter unless the degree of asymmetry is too large.

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