Sound-wave-like collective electronic excitations in Au atom chains

Tadaaki Nagao, Shin Yaginuma, Takeshi Inaoka, Toshio Sakurai, Dongryul Jeon

    研究成果: Article査読

    21 被引用数 (Scopus)

    抄録

    Sound-wave-like collective excitation in Au atom chains on the Si(557) surface is investigated. Electron scattering spectroscopy using a highly collimated slow electron beam has detected a characteristic low-energy one-dimensional (1D) plasmon (wire plasmon) that is confined in the atom chains. Theoretical analysis adopting a quantum-mechanical scheme beyond the free-electron model indicates a significant dynamic exchange-correlation effect due to strong 1D confinement. By cooling to below 100 K, we have detected for the first time a significant change in the plasmon dispersion in a tiny momentum and energy region, which definitely reflects a gap opening due to a metal-to-insulator transition of the atom chains.

    本文言語English
    論文番号114714
    ジャーナルjournal of the physical society of japan
    76
    11
    DOI
    出版ステータスPublished - 2007 11月 1

    ASJC Scopus subject areas

    • 物理学および天文学(全般)

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