论文标题
具有可调电子和拓扑特性的二维MX狄拉克材料家族
Two-dimensional MX family of Dirac materials with tunable electronic and topological properties
论文作者
论文摘要
我们在MX家族中提出了一种新颖的二维（2D）狄拉克材料（M = BE，MG，Zn和CD，X = Cl，Br和I），它们在大型能量尺度（0.8〜1.8 ev）和Ultra-High-high fermi-high Fermi Velocities上表现出具有线性分散的Dirac-Cone状态的石墨烯般的带状结构。发现电子和拓扑特性高度可调，可以通过阴离子层替代和垂直电场进行有效调制。该家族的几个成员的电子结构显示出接近Dirac节点能量的Van-Hove Singularity（VHS）。与这些VHS相关的增强密度可以提供诱导拓扑超导性的机制。相当大的带隙，超高载流子的迁移率和较小的有效质量的存在使MX家族有望用于电子和旋转的应用。
We propose a novel class of two-dimensional (2D) Dirac materials in the MX family (M=Be, Mg, Zn and Cd, X = Cl, Br and I), which exhibit graphene-like band structures with linearly-dispersing Dirac-cone states over large energy scales (0.8~1.8 eV) and ultra-high Fermi velocities comparable to graphene. The electronic and topological properties are found to be highly tunable and amenable to effective modulation via anion-layer substitution and vertical electric field. The electronic structures of several members of the family are shown to host a Van-Hove singularity (VHS) close to the energy of the Dirac node. The enhanced density-of-states associated with these VHSs could provide a mechanism for inducing topological superconductivity. The presence of sizable band gaps, ultra-high carrier mobilities, and small effective masses makes the MX family promising for electronics and spintronics applications.
