Light emission probing quantum shot noise and charge fluctuations at a biased molecular junction

N.L. Schneider, Jing Tao Lu, M. Brandbyge, R. Berndt

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The emission of plasmonic light from a single C60 molecule on Cu(111) is probed in a scanning tunneling microscope from the weak-coupling, tunneling range to strong coupling of the molecule to the electrodes at contact. At positive sample voltage the photon yield decreases owing to shot-noise suppression in an increasingly transparent quantum contact. At reversed bias an unexpected nonlinear increase occurs. First-principles transport calculations reveal that ultrafast charge fluctuations on the molecule give rise to additional noise at optical frequencies beyond the shot noise of the current that is injected to the tip. © 2012 American Physical Society.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume109
    Issue number18
    Number of pages18
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Calculations
    • Shot noise
    • Molecules

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