Quantum oscillations of the two-dimensional hole gas at atomically flat diamond surfaces

Yamaguchi Takahide, Hiroyuki Okazaki, Keita Deguchi, Shinya Uji, Hiroyuki Takeya, Yoshihiko Takano, Hidetoshi Tsuboi, Hiroshi Kawarada

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)


    Shubnikov-de Haas oscillations are observed in atomically flat hydrogen-terminated diamond surfaces with high-density hole carriers introduced by the electric field effect using an ionic liquid. The Shubnikov-de Haas oscillations depend only on the magnetic field component perpendicular to the diamond surface, thus providing evidence of two-dimensional Fermi surfaces. The effective masses estimated from the temperature dependence of the oscillations are close to the cyclotron effective masses of the valence band maxima in diamond. The estimated quantum scattering time is one order of magnitude longer than the transport scattering time and indicates that the carrier mobility is locally as high as several thousand cm2/V s at low temperature.

    Original languageEnglish
    Article number235304
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Issue number23
    Publication statusPublished - 2014 Jun 4

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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