Step bunching with both directions of the current: Vicinal W(110) surfaces versus atomistic-scale model

Olzat Toktarbaiuly, Victor Usov, Cormac Ó Coileáin, Katarzyna Siewierska, Sergey Krasnikov, Emma Norton, Sergey I. Bozhko, Valery N. Semenov, Alexander N. Chaika, Barry E. Murphy, Olaf Lübben, Filip Krzyzewski, Magdalena A. Załuska-Kotur, Anna Krasteva, Hristina Popova, Vesselin Tonchev, Igor V. Shvets

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    Abstract

    We report the observation of bunching of monoatomic steps on vicinal W(110) surfaces induced by step-up or step-down currents across the steps. Measurements reveal that the size-scaling exponent γ, connecting the maximal slope of a bunch with its height, differs depending on the current direction. We provide a numerical perspective by using an atomistic-scale model with a conserved surface flux to mimic experimental conditions, and also show that there is an interval of parameters in which the vicinal surface is unstable against step bunching for both directions of the adatom drift.

    Original languageEnglish
    Article number035436
    JournalPhysical Review B
    Volume97
    Issue number3
    DOIs
    Publication statusPublished - Jan 25 2018

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    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Toktarbaiuly, O., Usov, V., Ó Coileáin, C., Siewierska, K., Krasnikov, S., Norton, E., Bozhko, S. I., Semenov, V. N., Chaika, A. N., Murphy, B. E., Lübben, O., Krzyzewski, F., Załuska-Kotur, M. A., Krasteva, A., Popova, H., Tonchev, V., & Shvets, I. V. (2018). Step bunching with both directions of the current: Vicinal W(110) surfaces versus atomistic-scale model. Physical Review B, 97(3), [035436]. https://doi.org/10.1103/PhysRevB.97.035436