Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction

Jun Ichiro Ohe, Masayuki Yamamoto, Tomi Ohtsuki, Junsaku Nitta

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

A spin filtering in a two-dimensional electron system with nonuniform spin-orbit interactions (SOI) is theoretically studied. The strength of SOI is modulated perpendicular to the charge current. A spatial gradient of effective magnetic field due to the nonuniform SOI causes the Stern-Gerlach-type spin separation. The direction of the polarization is perpendicular to the current and parallel to the spatial gradient. Almost 100% spin polarization can be realized even without applying any external magnetic fields and without attaching ferromagnetic contacts. The spin polarization persists even in the presence of randomness.

Original languageEnglish
Article number041308
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number4
DOIs
Publication statusPublished - 2005 Jul 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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