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Resumo(s)
We characterize the elastic contribution to the surface free energy of a nematic liquid crystal in the presence of a sawtooth substrate. Our findings are based on numerical minimization of the Landau-de Gennes model and analytical calculations on the Frank-Oseen theory. The nucleation of disclination lines (characterized by non-half-integer winding numbers) in the wedges and apexes of the substrate induces a leading order proportional to q ln q to the elastic contribution to the surface free-energy density, with q being the wave number associated with the substrate periodicity.
Descrição
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Phase-Transitions Alignment Orientation Defects Samples Films Layer
Contexto Educativo
Citação
Romer-Enrique J M, Pham C, Patrício P. Scaling of the elastic contribution to the surface free energy of a nematic liquid crystal on a sawtoothed substrate.Physical Review E. 2010; 82 (1): Art. No. 011707 Part 1.