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

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

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)


    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.

    Original languageEnglish
    Article number114714
    Journaljournal of the physical society of japan
    Issue number11
    Publication statusPublished - 2007 Nov 1


    • Atom chain
    • One dimension
    • Plasmon

    ASJC Scopus subject areas

    • Physics and Astronomy(all)


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