Marian Smoluchowski Institute of Physics, Department of Statistical Physics and Mark Kac Center for Complex Systems Research, Jagellonian University, Reymonta 4, Kraków, Poland.
Phys Rev Lett. 2011 Jul 8;107(2):027802. doi: 10.1103/PhysRevLett.107.027802. Epub 2011 Jul 6.
We determine the bifurcation phase diagrams with isotropic (I), uniaxial (N(U)) and biaxial (N(B)) nematic phases for model bent-core mesogens using Onsager-type theory. The molecules comprise two or three Gay-Berne interacting ellipsoids of uniaxial and biaxial shape and a transverse central dipole. The Landau point is found to turn into an I-N(B) line for the three-center model with a large dipole moment. For the biaxial ellipsoids, a line of Landau points is observed even in the absence of the dipoles.
我们使用昂萨格型理论确定了各向同性（I）、单轴（N(U)) 和双轴（N(B))向列相的模型弯曲中心介晶的分岔相图。这些分子由两个或三个各向同性和双轴形状的 Gay-Berne 相互作用的椭球和一个横向中心偶极子组成。发现对于具有大偶极矩的三中心模型，朗道点变成 I-N(B)线。对于双轴椭球，即使没有偶极子，也会观察到一条朗道点线。
