Co-revolving topological defects in a nematic liquid crystal.
Co-revolving topological defects in a nematic liquid crystal.
复制标题
向列液晶中的共转拓扑缺陷。
DOI：
10.1039/d1sm01124c
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发表时间：
2021
期刊：
影响因子：
3.4
通讯作者：
C. Rosenblatt
中科院分区：
文献类型：
--
作者：
Adam L. Susser;S. Kralj;C. Rosenblatt
强度为m=+1的图案化表面缺陷及其相关的错列线可以分解成一对强度为m=+1/2的表面缺陷和错列线。对于受到外加交流电场E的负介电各向异性液晶，观察到这些半整数缺陷对于E><sup>I</sup><sup>1</sup>，而对于足够大的场，则绕着两个缺陷大约中间的中心点反向旋转。这一行为在实验上被解释为外加场强E和频率ν的函数，其中全共转的阈值磁场为ν1/2。同时，研究了向列相的电流体不稳定性。一个完整的场-频率“相图”令人信服地表明，通常静态缺陷的诱发涨落和最终的共转与流体动力不稳定性的存在有很强的耦合，并受其驱动。观察到的行为表明，一种类似莱曼的机制推动了共同革命。
A patterned surface defect of strength m = +1 and its associated disclination lines can decompose into a pair of surface defects and disclination lines of strength m = +1/2. For a negative dielectric anisotropy liquid crystal subjected to an applied ac electric field E, these half-integer defects are observed to wobble azimuthally for E > than some threshold field and, for sufficiently large fields, to co-revolve antipodally around a central point approximately midway between the two defects. This behavior is elucidated experimentally as a function of applied field strength E and frequency ν, where the threshold field for full co-revolution scales as ν1/2. Concurrently, nematic electrohydrodynamic instabilities were investigated. A complete field vs. frequency "phase diagram" compellingly suggests that the induced fluctuations and eventual co-revolutions of the ordinarily static defects are coupled strongly to-and driven by-the presence of the hydrodynamic instability. The observed behaviour suggests a Lehmann-like mechanism that drives the co-revolution.
影响因子：
41.2
作者：
DeCamp SJ;Redner GS;Baskaran A;Hagan MF;Dogic Z
通讯作者：
Dogic Z
DOI：
10.1073/pnas.1816733116
发表时间：
2019-03-12
影响因子：
11.1
作者：
Opathalage, Achini;Norton, Michael M.;Dogic, Zvonimir
通讯作者：
Dogic, Zvonimir