Creation of spin-polarized current using quantum point contacts and its detection

Mikio Eto, T. Hayashi, Y. Kurotani, H. Yokouchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We theoretically study the creation of spin-polarized current using quantum point contacts (QPCs) in the presence of Rashba spin-orbit interaction. When the conductance is quantized in units of 2e2/h, the current is spin-polarized in the transverse direction to the current flow. This is due to the transition between subbands of different spins during the transport through QPCs. No magnetic field is required. To detect the spin polarization of the current, we examine the transport properties of a QPC connected to a ferromagnetic lead. We observe the maximum (minimum) conductance when the magnetization in the lead is parallel or antiparallel (perpendicular) to the spin-polarization direction of the current from QPC.

Original languageEnglish
Title of host publicationMS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages301-306
Number of pages6
ISBN (Print)9812814612, 9789812814616
Publication statusPublished - 2008
Event4th International Symposium on Mesoscopic Superconductivity and Spintronics, MS+S 2006 - Atsugi, Japan
Duration: 2006 Feb 272006 Mar 2

Other

Other4th International Symposium on Mesoscopic Superconductivity and Spintronics, MS+S 2006
CountryJapan
CityAtsugi
Period06/2/2706/3/2

Fingerprint

Point contacts
Spin polarization
Lead
Transport properties
Magnetization
Orbits
Magnetic fields

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Eto, M., Hayashi, T., Kurotani, Y., & Yokouchi, H. (2008). Creation of spin-polarized current using quantum point contacts and its detection. In MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium (pp. 301-306). World Scientific Publishing Co. Pte Ltd.

Creation of spin-polarized current using quantum point contacts and its detection. / Eto, Mikio; Hayashi, T.; Kurotani, Y.; Yokouchi, H.

MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium. World Scientific Publishing Co. Pte Ltd, 2008. p. 301-306.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Eto, M, Hayashi, T, Kurotani, Y & Yokouchi, H 2008, Creation of spin-polarized current using quantum point contacts and its detection. in MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium. World Scientific Publishing Co. Pte Ltd, pp. 301-306, 4th International Symposium on Mesoscopic Superconductivity and Spintronics, MS+S 2006, Atsugi, Japan, 06/2/27.
Eto M, Hayashi T, Kurotani Y, Yokouchi H. Creation of spin-polarized current using quantum point contacts and its detection. In MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium. World Scientific Publishing Co. Pte Ltd. 2008. p. 301-306
Eto, Mikio ; Hayashi, T. ; Kurotani, Y. ; Yokouchi, H. / Creation of spin-polarized current using quantum point contacts and its detection. MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium. World Scientific Publishing Co. Pte Ltd, 2008. pp. 301-306
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AB - We theoretically study the creation of spin-polarized current using quantum point contacts (QPCs) in the presence of Rashba spin-orbit interaction. When the conductance is quantized in units of 2e2/h, the current is spin-polarized in the transverse direction to the current flow. This is due to the transition between subbands of different spins during the transport through QPCs. No magnetic field is required. To detect the spin polarization of the current, we examine the transport properties of a QPC connected to a ferromagnetic lead. We observe the maximum (minimum) conductance when the magnetization in the lead is parallel or antiparallel (perpendicular) to the spin-polarization direction of the current from QPC.

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