受限SmC * 液晶中解旋诱导的去线性
Dechiralisation lines induced unwinding in confined SmC* liquid crystals
摘要：
平面几何中SmC ~* 胞边界以下的去手性线的平衡和动力学行为是几十年来争论不休的话题。我们报道了在强极化液晶CFL 08的SmC* 相的新观察。它们与超流体和II型超导体中的涡旋运动进行了比较，我们提出了一个简单的启发式模型，试图解释散装螺旋螺距和线间距离之间的有趣的不匹配。这是由于螺旋线螺距和表面线电荷量对平衡线间距的相反影响所致。该模型假定线间电相互作用主导电池的平衡态。特别是，体螺旋的解旋转变是由场致线晶格位移引起的。它允许相关的线密度和临界场的固有能量参数，并解释间距距离失配，连同其几乎恒定的值在整个过渡。我们预见螺旋螺距和解绕场随样品宽度的变化。
英文摘要：
Equilibrium and dynamic behaviors of dechiralisation lines occurring below SmC* cell boundaries in planar geometry consitute a polemic topic for several decades. We report new observations in the SmC* phase of the strongly polarized liquid crystal CFL08. They are compared with vortex motions in superfluids and type-II superconductors, and we propose a simple heuristic model attempting to explain the intriguing mismatch between bulk helix pitch and inter-lines distance. It results from opposite effects of the helix pitch and surface lines charge value on the equilibrium lines distance. The model assumes that the lines electric interactions dominate the cell equilibrium state. In particular the unwinding transition of the bulk helix is provoked by field-induced displacements of the lines lattices. It permits to relate the lines density and critical fields to intrinsic energy parameters, and to explain the pitch-distance mismatch, together with its almost constant value across the transition. We foresee the helix pitch and unwinding field variations vs. sample width.
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