Nanograin formation of GaAs by high-pressure torsion

Yoshifumi Ikoma, Yoshimasa Ejiri, Kazunori Hayano, Katsuhiko Saito, Qixin Guo, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)


    Grain refinement of GaAs was achieved by application of severe plastic deformation through high-pressure torsion (HPT). Ultrafine-grained structures including nanograins were produced by the HPT processing under 24 GPa. An intense photoluminescence (PL) peak in the near infrared corresponding to the band gap of GaAs disappeared after the HPT processing but subsequent annealing gave rise not only to restoration of the original band-gap-related peak but also to an additional PL peak in the visible part of the spectrum on account of quantum confinement in the nanograins.

    Original languageEnglish
    Pages (from-to)1-8
    Number of pages8
    JournalPhilosophical Magazine Letters
    Issue number1
    Publication statusPublished - Nov 20 2013

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics


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