Creation and detection of spin-polarized current using quantum point contact with spin-orbit interaction

Hiroto Yokouchi, Mikio Eto

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We have proposed that quantum point contacts (QPCs) can be a useful tool for producing spin-polarized currents in the presence of Rashba spin-orbit (SO) interaction [J. Phys. Soc. Jpn. 74, 1934 (2005)]. No magnetic field is required. When the conductance through a QPC is quantized in units of 2e2/h, the current is spin-polarized in the transverse direction. This spin polarization, which can be larger than 50% in InGaAs heterostructures, is elucidated using the S-matrix formalism. We also examine transport properties of a QPC connected to a ferromagnetic lead and show how to detect the spin-polarized current from the QPC.

Original languageEnglish
Pages (from-to)557-559
Number of pages3
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume4
Issue number2
DOIs
Publication statusPublished - 2007

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spin-orbit interactions
transport properties
formalism
polarization
matrices
magnetic fields

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "We have proposed that quantum point contacts (QPCs) can be a useful tool for producing spin-polarized currents in the presence of Rashba spin-orbit (SO) interaction [J. Phys. Soc. Jpn. 74, 1934 (2005)]. No magnetic field is required. When the conductance through a QPC is quantized in units of 2e2/h, the current is spin-polarized in the transverse direction. This spin polarization, which can be larger than 50{\%} in InGaAs heterostructures, is elucidated using the S-matrix formalism. We also examine transport properties of a QPC connected to a ferromagnetic lead and show how to detect the spin-polarized current from the QPC.",
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AB - We have proposed that quantum point contacts (QPCs) can be a useful tool for producing spin-polarized currents in the presence of Rashba spin-orbit (SO) interaction [J. Phys. Soc. Jpn. 74, 1934 (2005)]. No magnetic field is required. When the conductance through a QPC is quantized in units of 2e2/h, the current is spin-polarized in the transverse direction. This spin polarization, which can be larger than 50% in InGaAs heterostructures, is elucidated using the S-matrix formalism. We also examine transport properties of a QPC connected to a ferromagnetic lead and show how to detect the spin-polarized current from the QPC.

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