Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots

Atsushi Tackeuchi, Takamasa Kuroda, Yoshiaki Nakata, Masahiro Murayama, Takamitsu Kitamura, Naoki Yokoyama

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    We have investigated antiferromagnetic coupling between semiconductor quantum dots. Electron spin is observed to flip at 80 ps after photoexcitation via the interdot-exchange interaction. The spin relaxation time under the antiferromagnetic order is extended to 10-12 ns, one order of magnitude longer than that in isolated quantum dots. The antiferromagnetic order exists at temperatures lower than 50-80 K. The photoluminescence experiments for various carrier densities show that antiferromagnetic coupling disappears when the electron pairing probability is low. A model calculation based on the Heitler-London approximation supports the finding that the antiferromagnetic order is observable at low temperature.

    Original languageEnglish
    Pages (from-to)4278-4281
    Number of pages4
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Volume42
    Issue number7 A
    Publication statusPublished - 2003 Jul

    Fingerprint

    electron spin
    Semiconductor quantum dots
    quantum dots
    Electrons
    Photoexcitation
    Exchange interactions
    photoexcitation
    Relaxation time
    Carrier concentration
    Photoluminescence
    relaxation time
    photoluminescence
    Temperature
    approximation
    electrons
    Experiments
    interactions

    Keywords

    • Antiferromagnetism
    • Quantum dot
    • Semiconductor
    • Spin

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots. / Tackeuchi, Atsushi; Kuroda, Takamasa; Nakata, Yoshiaki; Murayama, Masahiro; Kitamura, Takamitsu; Yokoyama, Naoki.

    In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 42, No. 7 A, 07.2003, p. 4278-4281.

    Research output: Contribution to journalArticle

    Tackeuchi, Atsushi ; Kuroda, Takamasa ; Nakata, Yoshiaki ; Murayama, Masahiro ; Kitamura, Takamitsu ; Yokoyama, Naoki. / Electron spin flip by antiferromagnetic coupling between semiconductor quantum dots. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2003 ; Vol. 42, No. 7 A. pp. 4278-4281.
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