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The Dirac materials, such as graphene and three-dimensional topologicalinsulators, have attracted much attention because they exhibit novel quantumphenomena with their low energy electrons governed by the relativistic Diracequations. One particular interest is to generate Dirac cone anisotropy so thatthe electrons can propagate differently from one direction to the other,creating an additional tunability for new properties and applications. Whilevarious theoretical approaches have been proposed to make the isotropic Diraccones of graphene into anisotropic ones, it has not yet been met with success.There are also some theoretical predictions and/or experimental indications ofanisotropic Dirac cone in novel topological insulators and AMnBi2 (A=Sr and Ca)but more experimental investigations are needed. Here we report systematic highresolution angle-resolved photoemission measurements that have provided directevidence on the existence of strongly anisotropic Dirac cones in SrMnBi2 andCaMnBi2. Distinct behaviors of the Dirac cones between SrMnBi2 and CaMnBi2 arealso observed. These results have provided important information on the stronganisotropy of the Dirac cones in AMnBi2 system that can be governed by thespin-orbital coupling and the local environment surrounding the Bi square net.

Strong Anisotropy of Dirac Cone in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy