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

    55 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
    Publication statusPublished - 1999 Aug 15

    Fingerprint

    electron spin
    Semiconductor quantum wells
    aluminum gallium arsenides
    quantum wells
    Relaxation time
    Electrons
    Relaxation processes
    relaxation time
    Energy gap
    Quantum confinement
    Pumps
    room temperature
    Temperature
    narrowband
    electrons
    arcs
    pumps
    energy
    probes

    Keywords

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

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Electron spin-relaxation dynamics in GaAs/AlGaAs quantum wells and InGaAs/InP quantum wells. / Tackeuchi, Atsushi; Kuroda, Takamasa; Muto, Shunichi; Nishikawa, Yuji; Wada, Osamu.

    In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 38, No. 8 B, 15.08.1999, p. 4680-4687.

    Research output: Contribution to journalArticle

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    AU - Nishikawa, Yuji

    AU - Wada, Osamu

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