Rashba spin-orbit interaction and its applications to spin-interference effect and spin-filter device

J. Nitta, T. Koga

Research output: Contribution to journalReview article

24 Citations (Scopus)

Abstract

The Rashba spin-orbit interaction in InGaAs quantum wells (QW) is studied using the weak antilocalization analysis as a function of the structural inversion asymmetry (SIA). We have observed a clear cross-over from positive to negative magnetoresistance near zero-magnetic field by controlling the degree of the SIA in the QWs. This is a strong evidence of a zero-field spin splitting that is induced by the Rashba effect. The spin-interference effect in a gate-controlled mesoscopic Aharonov-Bohm ring structure is investigated in the presence of Rashba spin-orbit interaction. The oscillatory behavior appearing in ensemble averaged Fourier spectrum of h/2e oscillations as a function of gate voltage is possibly because of the Aharonov-Casher type interference. We propose a spin-filter device based on the Rashba effect using a nonmagnetic resonant tunneling diode structure. Detailed calculation using InAIAs/InGaAs heterostructures shows that the spin-filtering efficiency exceeds 99.9%.

Original languageEnglish
Pages (from-to)689-696
Number of pages8
JournalJournal of Superconductivity and Novel Magnetism
Volume16
Issue number4
Publication statusPublished - 2003 Dec 1
Externally publishedYes

Keywords

  • Spin-filter
  • Spin-interference device
  • Spin-orbit interaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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