Nanofilm allotrope and phase transformation of ultrathin Bi film on Si(111)-7×7

T. Nagao, J. T. Sadowski, M. Saito, S. Yaginuma, Y. Fujikawa, T. Kogure, T. Ohno, Y. Hasegawa, S. Hasegawa, T. Sakurai

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    310 Citations (Scopus)

    Abstract

    Nanofilm allotrope and phase transformation of ultrathin Bi film on Si(111)-7 × 7 were analyzed using scanning tunneling microscopy and electron diffraction experiments. It was observed that this pseudocubic {012}-oriented allotrope is stable up to four atomic layers at room temperature. The entire volume of the film started to transform into a bulk single-crystal (001) phase, as the bulk contribution in the cohesion became dominant, above the critical thickness. It was proposed that the allotrope consists of black phosphorus-like puckered layers stabilized by saturating all the pz dangling bonds in the film, based on ab initio calculations.

    Original languageEnglish
    Article number105501
    Pages (from-to)105501-1-105501-4
    JournalPhysical review letters
    Volume93
    Issue number10
    DOIs
    Publication statusPublished - 2004 Sep 3

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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