Disorder-Induced Topological Defects in a d=2 Elastic Medium at Zero Temperature

Details Disorder-Induced Topological Defects in a d=2 Elastic Medium at Zero Temperature Disorder-Induced Topological Defects in a d=2 Elastic Medium at Zero Temperature

1998-07-28

arxiv.org/abs/cond-mat/9807374v1

Physical Review B 61, 14787-14790 (2000)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures included

Scientific paper

10.1103/PhysRevB.61.14787

The density and correlations of topological defects are investigated numerically in a model of a d=2 elastic medium subject to a periodic quenched random potential. The computed density of defects decreases approximately exponentially with the defect core energy. Comparing the defect-free ground state with the ground state with defects, it is found that the difference is described by string-like excitations, bounded by defect pairs, which have a fractal dimension of 1.250(3). At zero temperature, the disorder-induced defects screen the interaction of introduced vortex pairs.

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