Shear-induced melting of two-dimensional solids
We have carried out detailed nonequilibrium molecular-dynamics simulation studies of the shear-induced melting transition of a model two-dimensional solid. We find that the shear melting of the two-dimensional soft-disk solid at temperature [ital T]=1 and density [rho]=1.03 occurs in two stages: (1)...
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Veröffentlicht in: | Physical review. B, Condensed matter Condensed matter, 1993-03, Vol.47 (10), p.5622-5628 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We have carried out detailed nonequilibrium molecular-dynamics simulation studies of the shear-induced melting transition of a model two-dimensional solid. We find that the shear melting of the two-dimensional soft-disk solid at temperature [ital T]=1 and density [rho]=1.03 occurs in two stages: (1) a transition from elastic to plastic behavior takes place as soon as any finite shear rate is applied; (2) qualitative changes in structural and dynamic behavior occur near a shear rate of [gamma]=0.07. For [gamma][approx lt]0.07, the system possesses very long-range bond-orientational correlations, and the instantaneous static structure factor exhibits pronounced sixfold anisotropy, with a sixfold pattern that rotates uniformly with time in response to the applied shear. For [gamma][approx gt]0.07, the system behaves like an ordinary two-dimensional liquid under shear in that the ranges of translational and bond-orientational correlations are comparable and the instantaneous static structure factor does not exhibit persistent sixfold anisotropy. We discuss our results in terms of the two competing possibilities of a Kosterlitz-Thouless-Halperin-Nelson-Young two-stage melting scenario or a single first-order melting transition. |
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ISSN: | 0163-1829 1095-3795 |
DOI: | 10.1103/PhysRevB.47.5622 |