Self-organized defect strings in two-dimensional crystals

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2013
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Lechner, Wolfgang
Keim, Peter
Dellago, Christoph
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Zusammenfassung

Using experiments with single-particle resolution and computer simulations we study the collective behavior of multiple vacancies injected into two-dimensional crystals. We find that the defects assemble into linear strings, terminated by dislocations with antiparallel Burgers vectors. We show that these defect strings propagate through the crystal in a succession of rapid one-dimensional gliding and rare rotations. While the rotation rate decreases exponentially with the number of defects in the string, the diffusion constant is constant for large strings. By monitoring the separation of the dislocations at the end points, we measure their effective interactions with high precision beyond their spontaneous formation and annihilation, and we explain the double-well form of the dislocation interaction in terms of continuum elasticity theory.

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530 Physik
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Defects and impurities in crystals, microstructure, Colloids
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ISO 690LECHNER, Wolfgang, David POLSTER, Georg MARET, Peter KEIM, Christoph DELLAGO, 2013. Self-organized defect strings in two-dimensional crystals. In: Physical Review E. 2013, 88(6). ISSN 1539-3755. eISSN 1063-651X. Available under: doi: 10.1103/PhysRevE.88.060402
BibTex
@article{Lechner2013Selfo-25543,
  year={2013},
  doi={10.1103/PhysRevE.88.060402},
  title={Self-organized defect strings in two-dimensional crystals},
  number={6},
  volume={88},
  issn={1539-3755},
  journal={Physical Review E},
  author={Lechner, Wolfgang and Polster, David and Maret, Georg and Keim, Peter and Dellago, Christoph}
}
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