Light scattering and gapless excitations in antiferroelectric liquid crystals

被引：1
作者：
Blinc, R
Musevic, I
机构：
[1] J. Stefan Institute, 61,000 Ljubljana
来源：
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1997年 / 292卷
关键词：
antiferroelectric; liquid crystal; fluctuations;
D O I：
10.1080/10587259708031940
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The phason dispersion in the antiferroelectric SmCA* liquid crystalline phase of 4-(1-methylheptyl-oxycarbonyl) phenyl 4'-octyloxybiphenyl-4-carboxylate has been studied by time-resolved quasielastic light scattering spectroscopy. The phason branch is found to be gapless as predicted for a Goldstone mode recovering the broken continuous symmetry. The dispersion has a minimum at q = 2q(c), where q(c) is the wave-vector of the helicoidal SmCA* phase. The results are consistent with the alternating-tilt model of antiferroelectric liquid crystals and the first order approximation to the optical properties of birefringent and modulated superstructures.
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收藏
页码：311 / 322
页数：12
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