Hu Zhixiang, Deng Junze, Li Hang, Ogunbunmi Michael O, Tong Xiao, Wang Qi, Graf David, Pudełko Wojciech Radoslaw, Liu Yu, Lei Hechang, Bobev Svilen, Radovic Milan, Wang Zhijun, Petrovic Cedomir
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA.
Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11790 USA.
NPJ Quantum Mater. 2023;8(1):20. doi: 10.1038/s41535-023-00549-8. Epub 2023 May 6.
Topological semimetals such as Dirac, Weyl or nodal line semimetals are widely studied for their peculiar properties including high Fermi velocities, small effective masses and high magnetoresistance. When the Dirac cone is tilted, exotic phenomena could emerge whereas materials hosting such states are promising for photonics and plasmonics applications. Here we present evidence that SrAgBi is a spin-orbit coupling-induced type-II three-dimensional Dirac semimetal featuring tilted Dirac cone at the Fermi energy. Near charge compensation and Fermi surface characteristics are not much perturbed by 7% of vacancy defects on the Ag atomic site, suggesting that SrAgBi could be a material of interest for observation of robust optical and spintronic topological quantum phenomena.
狄拉克半金属、外尔半金属或节线半金属等拓扑半金属因其独特性质而受到广泛研究，这些性质包括高费米速度、小有效质量和高磁阻。当狄拉克锥倾斜时，可能会出现奇异现象，而承载这种状态的材料在光子学和等离子体应用方面很有前景。在此，我们提供证据表明，SrAgBi是一种自旋轨道耦合诱导的II型三维狄拉克半金属，在费米能级处具有倾斜的狄拉克锥。接近电荷补偿时，Ag原子位点上7%的空位缺陷对费米面特性的扰动不大，这表明SrAgBi可能是一种用于观测稳健光学和自旋电子拓扑量子现象的有趣材料。
