Dynamics and Instabilities of Defects in Curved Two-Dimensional Crystals

ORAL

Abstract

Point defects play a fundamental role in determining the thermodynamic, elastic and mechanical properties of two-dimensional crystals. When such crystals are curved, finite length grain boundaries (scars) appear as basic structural features. We discuss an analytical determination of the elastic spring constants of dislocations bound within scars and compare them with existing experimental measurements from optical microscopy. We further show that vacancies and interstitials, which are stable defects in flat crystals, are generally unstable in curved geometries.

*The work of MB amd HS was supported by NSF grant ITR-DMR-0219292 and that of AT by NSF grant ITR-DMR-0426597

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Authors

  • Mark Bowick

    • Syracuse University

  • Homin Shin

    • Syracuse University

  • Alex Travesset

    • Iowa State University and Ames Lab
    • Iowa State University
    • Department of Physics and Astronomy, Iowa State University and Ames Laboratory
    • Ames Laboratory and Department of Physics and Astronomy, Iowa
    • Iowa State University and Ames Lab.
    • Iowa State University and Ames National Laboratory