Strong anisotropy of Dirac cones in SrMnBi2 and CaMnBi2 revealed by angle-resolved photoemission spectroscopy.
Strong anisotropy of Dirac cones in SrMnBi2 and CaMnBi2 revealed by angle-resolved photoemission spectroscopy.
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角分辨光电发射光谱揭示 SrMnBi2 和 CaMnBi2 中狄拉克锥体的强各向异性
DOI：
10.1038/srep05385
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发表时间：
2014-06-20
影响因子：
4.6
通讯作者：
Zhou XJ
中科院分区：
文献类型：
--
作者：
Feng Y;Wang Z;Chen C;Shi Y;Xie Z;Yi H;Liang A;He S;He J;Peng Y;Liu X;Liu Y;Zhao L;Liu G;Dong X;Zhang J;Chen C;Xu Z;Dai X;Fang Z;Zhou XJ
Dirac材料，如石墨烯和三维拓扑绝缘体，由于其低能电子受相对论Dirac方程控制而表现出新颖的量子现象，引起了人们的广泛关注。一个特别的兴趣是产生狄拉克锥各向异性，使电子可以从一个方向不同地传播到另一个方向，为新的属性和应用创造额外的可调谐性。虽然已经提出了各种理论方法来将石墨烯的各向同性狄拉克锥变成各向异性狄拉克锥，但尚未取得成功。在新型拓扑绝缘体和AMnBi_2（A = Sr和Ca）中也有一些各向异性狄拉克锥的理论预测和/或实验指示，但需要更多的实验研究。在这里，我们报告系统的高分辨率角分辨光电子能谱测量，提供了直接的证据上存在的强各向异性狄拉克锥SrMnBi 2和CaMnBi 2。SrMnBi_2和CaMnBi_2之间的狄拉克锥的不同行为也被观察到。这些结果为AMnBi_2系统中Dirac锥的强各向异性提供了重要的信息，这种各向异性可以由自旋轨道耦合和Bi方网周围的局域环境所控制.
The Dirac materials, such as graphene and three-dimensional topological insulators, have attracted much attention because they exhibit novel quantum phenomena with their low energy electrons governed by the relativistic Dirac equations. One particular interest is to generate Dirac cone anisotropy so that the electrons can propagate differently from one direction to the other, creating an additional tunability for new properties and applications. While various theoretical approaches have been proposed to make the isotropic Dirac cones of graphene into anisotropic ones, it has not yet been met with success. There are also some theoretical predictions and/or experimental indications of anisotropic Dirac cone in novel topological insulators and AMnBi2 (A = Sr and Ca) but more experimental investigations are needed. Here we report systematic high resolution angle-resolved photoemission measurements that have provided direct evidence on the existence of strongly anisotropic Dirac cones in SrMnBi2 and CaMnBi2. Distinct behaviors of the Dirac cones between SrMnBi2 and CaMnBi2 are also observed. These results have provided important information on the strong anisotropy of the Dirac cones in AMnBi2 system that can be governed by the spin-orbital coupling and the local environment surrounding the Bi square net.
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