Effects of vacancies and interstitials on the phonon modes in a 2D colloidal crystal

ORAL

Abstract

We report a study of the effects of vacancies and interstitials on the phonon modes in a 2D colloidal crystal. By applying the equi-partition theorem, we extract the dispersion relation of the lattice vibrations in a two-dimensional colloidal crystal using real-time video microscopy. We find that both longitudinal and transverse modes in the spectrum are softened by the existence of vacancies and interstitials.

*This work was supported by a grant from NSF-DMR.

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Authors

  • Lichao Yu

    • Brown University

  • Sungcheol Kim

    • Brown University

  • Di Yin

    • Wuhan University and Brown University

  • Alexandros Pertsinidis

    • Sloan-Kettering Institute, New York

  • Xinsheng Ling

    • Brown University