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SJ Singer

Publications and source records attributed to SJ Singer.

6 recordsLinked to original sources
PubMed2000

Stripe melting in a two-dimensional system with competing interactions

A model with competing short-ranged attractions and long-ranged repulsions that describes self-organized patterns in systems like Langmuir monolayers, magnetic films, and adsorbed monolayers is studied using numerical simulations and analytic theory. Simulations provide strong evidence confirming that the stripe phase order is destroyed in a defect unbinding transition. Large scale computer simulations are in agreement with an analytic scaling theory, which also predicts an eventual crossover from defect-mediated stripe melting to a spin-disordering (or particle-mixing) mechanism with decreasing repulsion strength.

Journal Article↗
PubMed2000

Buckling induced by dilative strain in two- and three-dimensional layered materials

Buckling of stripes in two dimensions, or layers in three dimensions, induced by dilative strain, is observed in thin films, in liquid crystals, and at interfaces. Equations for the buckling pattern are analyzed and solved in this work. We have previously predicted buckling patterns in two-dimensional systems, which were subsequently successfully compared with experiment. Here we make predicted buckling profiles for three-dimensional layered materials available for comparison with experiment. We also analyze dilative strain-induced buckling on a qualitative level, in terms of mechanical analogy, and compare the modulation pattern with that which arises in other contexts.

Journal Article↗