弯芯液晶中的手征对称性破缺
Chiral Symmetry Breaking in Bent-Core Liquid Crystals
摘要：
通过分子模拟，我们证明了在双核液晶系统中发现的超长程有序应该揭示出进一步的空间均匀相。其中两种被鉴定为具有$D_{2d}$对称性的四面体双（$N_T$）相和具有$D_2$对称性的手性四面体双（$N_T^*$）相。这些新的相位被发现的四极和八极各向异性相互作用的晶格模型，使用平均场理论和蒙特卡罗模拟。相图显示出四面体（$T$）、$N_T$和$N_T^*$相，以及普通的各向同性（$I$）、单轴双相（$N_U$）和双轴双相（$N_B$）。据我们所知，这是第一个在非层状体系中具有自发手征对称性破缺的分子模型。
英文摘要：
By molecular modeling we demonstrate that the nematic long-range order discovered in bent-core liquid crystal systems should reveal further spatially homogeneous phases. Two of them are identified as a tetrahedratic nematic ($N_T$) phase with $D_{2d}$ symmetry and a chiral tetrahedratic nematic ($N_T^*$) phase with $D_2$ symmetry. These new phases were found for a lattice model with quadrupolar and octupolar anisotropic interactions using Mean Field theory and Monte Carlo simulations. The phase diagrams exhibit tetrahedratic ($T$), $N_T$ and $N_T^*$ phases, in addition to ordinary isotropic ($I$), uniaxial nematic ($N_U$) and biaxial nematic ($N_B$) phases. To our knowledge, this is the first molecular model with spontaneous chiral symmetry breaking in non-layered systems.
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