Electron spin-relaxation dynamics in GaAs/AlGaAs quantum wells and InGaAs/InP quantum wells

Atsushi Tackeuchi, Takamasa Kuroda, Shunichi Muto, Yuji Nishikawa, Osamu Wada

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

We have investigated the spin-relaxation process of electrons at room temperature in undoped GaAs/AlGaAs multiple-quantum wells (MQWs) and InGaAs/InP MQWs. The spin-relaxation times are measured for different well thicknesses using time-resolved spin-dependent pump and probe absorption measurement. The spin-relaxation time, τs, for GaAs MQWs was found to depend on the electron confinement energy, E1e, according to τs ∝ E1e-2.2, demonstrating that the main spin-relaxation mechanism at room temperature is the D'yakonov-Perel' process. The measured spin-relaxation times of InGaAs MQWs whose band-gap is about half that of GaAs MQWs arc about 5 ps and vary depending on the quantum confinement energy, E1e, according to τs ∝ E1e-1.0. The spin-relaxation time by Elliott-Yafet process, which becomes stronger for narrower band-gap materials, is calculated for quantum wells and shown to vary according to τs ∝ E1e-1. The spin-relaxation mechanism and possible applications using this fast spin-relaxation process are discussed.

Original languageEnglish
Pages (from-to)4680-4687
Number of pages8
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume38
Issue number8 B
DOIs
Publication statusPublished - 1999 Aug 15

Keywords

  • D'yakonov-Perel'
  • Electron
  • Elliott-Yafet
  • InGaAs
  • MOW
  • Spin-relaxation

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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