Laser-assisted field evaporation from insulators triggered by photoinduced hole accumulation

H. Tamura, M. Tsukada, K. P. McKenna, A. L. Shluger, T. Ohkubo, K. Hono

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    We analyze the mechanism of laser-assisted field evaporation from insulators triggered by photoinduced hole accumulation at the tip apex. The effects of hole accumulation on the electric flux line and the activation barrier for field evaporation are analyzed by the boundary element method with a mesoscopic model and atomistic ab initio calculations. The ab initio calculations indicate that a certain amount of hole accumulation reduces the activation barrier for field evaporation substantially. We propose the following scenario for laser-assisted field evaporation from insulators: 1) a laser pulse creates holes in the valence band of oxide through electronic excitation, 2) the holes accumulate at the tip apex due to the external direct-current electric field, 3) the positive charge at the apex reduces the activation barrier for cation evaporation, 4) the cation evaporates from the apex, and 5) the next laser pulse creates holes again and triggers subsequent field evaporations.

    Original languageEnglish
    Article number195430
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number19
    DOIs
    Publication statusPublished - 2012 Nov 26

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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