Observation of interdot tunneling process of spin-polarized electrons

Atsushi Tackeuchi, Y. Nakata, R. Sasou, K. Mase, T. Kuroda, N. Yokoyama

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    We have directly observed the spin-polarized electron tunneling process between double quantum dots (QDs) using spin-dependent time-resolved photoluminescence measurements. The spin relaxation times in isolated In0.9Al0.1As Stranski-Krastanow (SK)-mode QDs and InAs SK-mode QDs were measured as 1.3 and 1.2 ns, respectively. The fact that these times are longer than those of quantum wells indicates that the spin relaxation rate is suppressed in QDs by the increased zero dimensionality. The measurement of tunneling between double QDs which consist of In0.9Al0.1As QDs and InAs QDs indicates that the spin relaxation time is not affected by the tunneling process. The spin-polarized carriers were found to tunnel from one dot to another dot while retaining spin polarization.

    Original languageEnglish
    Pages (from-to)32-35
    Number of pages4
    JournalPhysica E: Low-Dimensional Systems and Nanostructures
    Volume10
    Issue number1-3
    DOIs
    Publication statusPublished - 2001 May

    Fingerprint

    Semiconductor quantum dots
    quantum dots
    Electrons
    electrons
    Laser modes
    Relaxation time
    relaxation time
    Spin polarization
    Electron tunneling
    electron tunneling
    retaining
    Semiconductor quantum wells
    tunnels
    Photoluminescence
    Tunnels
    quantum wells
    photoluminescence
    polarization

    Keywords

    • Quantum dots
    • Spin
    • Spin relaxation
    • Tunnel

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Observation of interdot tunneling process of spin-polarized electrons. / Tackeuchi, Atsushi; Nakata, Y.; Sasou, R.; Mase, K.; Kuroda, T.; Yokoyama, N.

    In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 10, No. 1-3, 05.2001, p. 32-35.

    Research output: Contribution to journalArticle

    Tackeuchi, Atsushi ; Nakata, Y. ; Sasou, R. ; Mase, K. ; Kuroda, T. ; Yokoyama, N. / Observation of interdot tunneling process of spin-polarized electrons. In: Physica E: Low-Dimensional Systems and Nanostructures. 2001 ; Vol. 10, No. 1-3. pp. 32-35.
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    AU - Kuroda, T.

    AU - Yokoyama, N.

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