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

Hiroto Yokouchi; Mikio Eto

doi:10.1002/pssc.200673266

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

Hiroto Yokouchi, Mikio Eto

Department of Physics

Research output: Contribution to journal › Conference article › peer-review

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 language	English
Pages (from-to)	557-559
Number of pages	3
Journal	Physica Status Solidi (C) Current Topics in Solid State Physics
Volume	4
Issue number	2
DOIs	https://doi.org/10.1002/pssc.200673266
Publication status	Published - 2007 Dec 1
Event	International Conference on Superlattices, Nano-structures and Nano-devices, ICSNN-2006 - Istanbul, Turkey Duration: 2006 Jul 30 → 2006 Aug 4

ASJC Scopus subject areas

Condensed Matter Physics

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10.1002/pssc.200673266

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title = "Creation and detection of spin-polarized current using quantum point contact with spin-orbit interaction",

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.",

author = "Hiroto Yokouchi and Mikio Eto",

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T1 - Creation and detection of spin-polarized current using quantum point contact with spin-orbit interaction

AU - Yokouchi, Hiroto

AU - Eto, Mikio

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N2 - 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.

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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