Dispersion-free optical activity in non-centrosymmetric metals

非中心对称BiTeI的表面和体费米学及能带色散

Surface and bulk Fermiology and band dispersion in non-centrosymmetric BiTeI

BiTeI具有层状和非中心对称结构，其中强的自旋-轨道相互作用导致体带中的巨大自旋分裂。在这里，我们提出了高分辨率的角度分辨光电发射（ARPES）的数据，在紫外和软X射线制度，清楚地解开从散装电子结构的表面。自旋分辨UV-ARPES测量相反，非等效表面上显示相同的自旋结构，从而澄清表面状态字符。软X射线ARPES数据清楚地揭示了由自旋轨道相互作用引起的体费米表面的纺锤环形状。

Non-reciprocal magnons in non-centrosymmetric MnSi

Using two cold-neutron triple-axis spectrometers we have succeeded in fully mapping out the field-dependent evolution of the non-reciprocal magnon dispersion relations in all magnetic phases of MnSi. The non-reciprocal nature of the dispersion manifests itself in a full asymmetry (non-reciprocity) of the dynamical structure factor $S(q, E, μ_0 H_{int})$ with respect to flipping either the direction of the applied magnetic field $μ_0 H_{int}$, the reduced momentum transfer $q$, or the energy transfer $E$.

Topological phase in non-centrosymmetric material NaSnBi

We predict that a non-centrosymmetric material NaSnBi locates in a three-dimensional non-trivial topological phase under ambient pressure based on first-principle calculations. By deriving the effective model around $Γ$ point, we find that the topological phase transition is driven by a Rashba spin-orbital coupling through an odd number of pairs of band touch because of a small anisotropic gap caused by quintic dispersion terms. In contrast to conventional topological insulators, the spin texture of surface Dirac cone is right-handed and the surface states are strikingly different for differen…

Electronic and lattice properties of non-centrosymmetric superconductors ThTSi (T = Co, Ir, Ni, and Pt)

The theoretical studies on the electronic and lattice properties of the series of non-centrosymmetric superconductors ThTSi, where T = Co, Ni, Ir, and Pt are presented. The electronic band structure and crystal parameters were optimized within the density functional theory. The spin-orbit coupling leads to the splitting of the electronic bands and Fermi surfaces, with the stronger effect observed for the compounds with the heavier atoms Ir and Pt. The possible mixing of the spin-singlet and spin-triplet pairing in the superconducting state is discussed. The phonon dispersion relations and phon…

非中心对称过渡金属单磷化物中的Weyl半金属相

Weyl semimetal phase in non-centrosymmetric transition metal monophosphides

基于第一性原理计算，我们证明了包括TaAs、TaP、NbAs和NbP在内的一类半导体材料都是无反转中心的Weyl半金属（WSM）。我们发现，在整个布里渊区（BZ）的12对外尔点的每一个。在没有自旋-轨道耦合（SOC）的情况下，镜像不变平面中的带反转导致能量-动量色散中的无隙节环。这些材料中的强SOC然后在镜像平面中打开全部间隙，产生非零镜像陈氏数和离开镜像平面的外尔点。在（001）和（100）表面上得到的表面态费米弧结构也显示出有趣的形状，为未来的实验研究指出了迷人的游乐场。

磁性壁纸/空间群中的交替磁性目录及非对称交替磁体

Catalog of Altermagnetism in Magnetic Wallpaper/Space Groups and Nonsymmorphic Altermagnets

研究通过无自旋时间反演对称性扩展交替磁性分类到非中心对称晶体，给出二维磁性壁纸群和三维磁性空间群的交替磁序目录，揭示非对称对称性对实现新交替磁能带结构的关键作用。