2008/06/30 by Xiangjun Xing
Engineering · Materials Science · Physics and Astronomy · #Advanced Materials and Mechanics #Anisotropy #Differential (mechanical device) #Differential geometry #Liquid Crystal Research Advancements #Liquid crystal #Manifold (fluid mechanics) #Phase (matter) #Phase diagram #Photonic Crystals and Applications #Superposition principle #Torus #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1007/s10955-009-9681-9
56 pages, 21 eps figures. To appear in the Journal of Statistical Physics
arxiv created 2009/01/11 · openalex publication_date 2009/02/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Smectic order on arbitrary curved substrate can be described by a differential form of rank one (1-form), whose geometric meaning is the differential of the local phase field of the density modulation. The exterior derivative of 1-form is the local dislocation density. Elastic deformations are described by superposition of exact differential forms. We use the formalism of differential forms to systematically classify and characterize all low energy smectic states on torus as well as on sphere. A two dimensional smectic order confined on either manifold exhibits many topologically distinct low energy states. Different states are not accessible from each other by local fluctuations. The total number of low energy states scales as the square root of the system area. We also address the energetics of 2D smectic on a curved substrate and calculate the mean field phase diagram of smectic on a thin torus. Finally, we discuss the motion of disclinations for spherical smectics as low energy excitations, and illustrate the interesting connection between spherical smectic and the theory of elliptic functions.