Spin filter using semiconductor point contacts with spin-orbit interaction

M. Eto, T. Hayashi, Y. Kurotani

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

Abstract

We theoretically study the ballistic transport through a quantum wire with a narrow constriction, "point contact," in the presence of Rashba spin-orbit (SO) interaction. By numerical studies, we find that the conductance is quantized in units of 2e2/h when the constriction changes gradually in space, and that the current is spin-polarized in the transverse direction. This is due to the transition between subbands of different spins during the transport through the point contact. The spin-polarization ratio is determined by the adiabaticity of the transition, which is evaluated by the Landau-Zener theory. The spin polarization of 60% can be realized with experimentally accessible values of the SO interaction strength.

Original languageEnglish
Title of host publicationLOW TEMPERATURE PHYSICS
Subtitle of host publication24th International Conference on Low Temperature Physics - LT24
Pages1516-1517
Number of pages2
DOIs
Publication statusPublished - 2006 Dec 1
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: 2006 Aug 102006 Oct 17

Publication series

NameAIP Conference Proceedings
Volume850
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
CountryUnited States
CityOrlando, FL
Period06/8/1006/10/17

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Keywords

  • Conductancequantization
  • Point contact
  • Rashba
  • Spin-orbitinteraction
  • Spinfilter

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

Cite this

Eto, M., Hayashi, T., & Kurotani, Y. (2006). Spin filter using semiconductor point contacts with spin-orbit interaction. In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 (pp. 1516-1517). (AIP Conference Proceedings; Vol. 850). https://doi.org/10.1063/1.2355279