| First-order Fréedericksz transition at the threshold point for weak anchoring nematic liquid crystal cell under external electric and magnetic fields |
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| 引用本文： | 关荣华,杨国琛.First-order Fréedericksz transition at the threshold point for weak anchoring nematic liquid crystal cell under external electric and magnetic fields[J].中国物理 B,2003,12(11):1283-1290. |
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| 作者姓名： | 关荣华 杨国琛 |
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| 作者单位： | (1)Department of Applied Physics, North China Electric Power University, Baoding 071003, China; Institute of Material Physics, Hebei University of Technology, Tianjin 300130, China; (2)Institute of Material Physics, Hebei University of Technology, Tianjin 300130, China |
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| 摘 要： | Based on the modified formula of Rapini-Papoular, the equilibrium equation and boundary condition of the director have been obtained and the behaviour of the Fréedericksz transition at the threshold point has been studied for weak-anchoring nematic liquid crystal cells under external electric and magnetic fields with the methods of analytical derivation and numerical calculation. The results show that, except for the usual second-order transition, the first-order Fréedericksz transition can also be induced by a suitable surface anchoring technique for the liquid crystal cell given in the paper. The conditions for the existence of the first-order Fréedericksz transition are obtained. They are related to the material elastic coefficient k_{11}, k_{33} the thickness of the liquid crystal cell, the external electric field and the strength of surface anchoring, etc.
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| 关 键 词： | weak anchoring threshold point first-order Fréedericksz transition electric and magnetic fields |
| 收稿时间： | 2003-06-20 |
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