Mechanisms of defect motion in hexagonal systems on sinusoidal substrates

N. A. GARCÍA; L. R. GÓMEZ; D. A. VEGA

Boston

Congreso; March meeting of the American Physical Society; 2012

American Physical Society

In this work we have studied through a Landau´s free energy functional approach the dynamicand equilibrium configurations of two-dimensional hexagonal systems constrained to lie on asubstrate with sinusoidal topography. Similarly to previous studies, we have found a strongcoupling between defects and geometry, where the regions with the highest local Gaussiancurvature act as sink for disclinations. We have studied the influence of the local curvature ofthe substrate on the diffusional dynamics of dislocations and disclinations. We have found anovel mechanism of defect diffusion where linearly correlated arrays of dislocations (scars)move according to the gradient of curvature.