We investigate dynamic magneto-optic effects in a ferromagnetic nematic liquid crystal experimentally and theoretically. Experimentally we measure the magnetization and the phase difference of the transmitted light when an external magnetic field is applied. As a model we study the coupled dynamics of the magnetization, M, and the director field, n, associated with the liquid crystalline orientational order. We demonstrate that the experimentally studied macroscopic dynamic behavior reveals the importance of a dynamic cross-coupling between M and n. The experimental data are used to extract the value of the dissipative cross-coupling coefficient. We also make concrete predictions about how reversible cross-coupling terms between the magnetization and the director could be detected experimentally by measurements of the transmitted light intensity as well as by analyzing the azimuthal angle of the magnetization and the director out of the plane spanned by the anchoring axis and the external magnetic field. We derive the eigenmodes of the coupled system and study their relaxation rates. We show that in the usual experimental set-up used for measuring the relaxation rates of the splay-bend or twist-bend eigenmodes of a nematic liquid crystal one expects for a ferromagnetic nematic liquid crystal a mixture of at least two eigenmodes.
Electro-optic switching of dielectrically negative nematic through nanosecond electric modification of order parameter (NEMOP)
我们目前的实验研究纳秒电修改的序参量（NEMOP）在各种负介电各向异性的介电材料。该研究表明，NEMOP能够实现大幅度的快速（纳秒）电光响应，场致双折射的数量级为0.01，品质因数（FoM）的数量级为$10^4$ $μ$ m $^2/$ s;后者的数量级高于传统上用于电光MEMS器件的弗雷德里克效应的FoM。NEMOP响应的幅度通常在具有较大介电各向异性和较高自然（无场）双折射的向列相中更强。
Self-organized composites of multiwalled carbon nanotubes and nematic liquid crystal 5CB: Optical singularities and percolation behavior in electrical conductivity
Structural distortion behind the nematic superconductivity in Sr$_x$Bi$_2$Se$_3$
典型的层状拓扑绝缘体Bi $_2$ Se $_3$在掺杂Sr、Nb或Cu时变成半导体。这些材料在面内磁场存在下的超导性质证明了自发对称性破缺：180 $^\circ$ -超导性的旋转对称性与120 $^\circ$ -晶体的旋转对称性。这种行为极好地证实了拓扑超导电性。这种向列性在多大程度上是由于这些材料中的超导配对，而不是由于晶体结构扭曲？这个问题仍然没有答案，因为到目前为止，在这些材料中没有明显的偏离三重晶体对称性。为了解决这个问题，我们生长高品质的单晶体的Sr $_x$ Bi $_2$ Se $_3$，进行详细的X射线衍射和磁输运研究，并揭示所观察到的超导向列性方向与这些样品中的小的结构扭曲的方向（$\sim 0.02$ \%伸长率在一个结晶方向）。另外的各向异性来自微晶轴的取向。2-在远高于临界温度的最均匀的晶体中观察到的磁阻的折叠对称性表明这些结构畸变仍然足够强。我们的数据结合强样品到样品的变化的超导各向异性参数的指示的意义的结构因素在表观超导性锶$_x$ Bi $_2$ Se $_3$。
Anomalous high-magnetic field electronic state of the nematic superconductors FeSe$_{1-x}$S$_x$
要理解超导性，就需要对它产生的正常电子态有详细的了解。打破晶格的旋转对称性的电子态可以潜在地促进与超导性相关的独特散射。在这里，我们调查的正常运输的超导FeSe $_{1-x}$ S $_x$跨越一个超导相变使用高达69 T的高磁场，以建立温度和场的依赖性。我们发现，该态是一种反常的非费米液体，在低温下由线性电阻率占主导地位，可以转化为费米液体，这取决于组成$x$和杂质水平。在接近相变终点时，我们发现了一个具有$T^{1.5}$电阻率的扩展温度区。在一个大的磁场范围内的横向磁电阻的$H^{1.55}$的依赖性，它显示了一个不寻常的峰值在低温下的内的磁相。我们的研究揭示了向列相内部的异常输运，这是由多带系统电子结构变化与受大磁场和无序影响的异常散射过程之间的微妙相互作用驱动的
Synchronously controlled optical modes in the transmittance and reflectance spectra of multilayer photonic structure with dual-frequency nematic liquid crystal
Soft modes of the dielectric response in the twist-bend nematic phase and identification of the transition to nematic splay bend phase in the dimer CBC7CB
