Spin polarization at semiconductor point contacts in absence of magnetic field

Mikio Eto, Tetsuya Hayashi, Yuji Kurotani

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Semiconductor point contacts can be a useful tool for producing spin-polarized currents in the presence of spin-orbit (SO) interaction. Neither magnetic fields nor magnetic materials are required. By numerical studies, we show that (i) the conductance is quantized in units of 2e2/h unless the SO interaction is too strong, (ii) the current is spin-polarized in the transverse direction, and (iii) a spin polarization of more than 50% can be realized with experimentally accessible values of the SO interaction strength. The spin-polarization ratio is determined by the adiabaticity of the transition between subbands of different spins during the transport through the point contacts.

Original languageEnglish
Pages (from-to)1934-1937
Number of pages4
JournalJournal of the Physical Society of Japan
Volume74
Issue number7
DOIs
Publication statusPublished - 2005 Jul

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spin-orbit interactions
polarization
magnetic fields
magnetic materials

Keywords

  • Conductance quantization
  • Landau-Zener
  • Point contact
  • Rashba
  • Spin filter
  • Spin-orbit interaction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Spin polarization at semiconductor point contacts in absence of magnetic field. / Eto, Mikio; Hayashi, Tetsuya; Kurotani, Yuji.

In: Journal of the Physical Society of Japan, Vol. 74, No. 7, 07.2005, p. 1934-1937.

Research output: Contribution to journalArticle

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AB - Semiconductor point contacts can be a useful tool for producing spin-polarized currents in the presence of spin-orbit (SO) interaction. Neither magnetic fields nor magnetic materials are required. By numerical studies, we show that (i) the conductance is quantized in units of 2e2/h unless the SO interaction is too strong, (ii) the current is spin-polarized in the transverse direction, and (iii) a spin polarization of more than 50% can be realized with experimentally accessible values of the SO interaction strength. The spin-polarization ratio is determined by the adiabaticity of the transition between subbands of different spins during the transport through the point contacts.

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