论文类型：期刊论文
第一作者：Tao Deng
通讯作者：Yulin Chen,Zhongkai Liu
合写作者：Gang Xu,Yanfeng Guo,Zhi Liu,Lexian Yang,Makoto Hashimoto,Donghui Lu,Eli Rotenberg,Aaron Bostwick,Chris Jozwiak,Kui Huang,Chengwei Wang,Haifeng Yang,Shengtao Cui,Aiji Liang,Junyi He,Hao Su,Cheng Chen
发表刊物：Physical Review B
收录刊物：SCI
学科门类：理学
一级学科：物理学
文献类型：J
卷号：102
期号：4
页面范围：45106
ISSN号：2469-9950
发表时间：2020-07-06
影响因子：4.036
摘要：There has been an upsurge in the discovery of topological quantum materials, where various topological insulators and semimetals have been theoretically predicted and experimentally observed. However, very few of them contain silicon, the most widely used element in the electronics industry. Recently, ternary compound CaAl2Si2 has been predicted to be a topological Dirac semimetal, hosting Lorentz-symmetry-violating quasiparticles with a strongly tilted conical band dispersion. In this work, by using high-resolution angle-resolved photoemission spectroscopy, we investigated the comprehensive electronic structure of CaAl2Si2. A pair of topological Dirac crossings is observed along the kz direction, in good agreement with the ab initio calculations, confirming the topological Dirac semimetal nature of the compound. Our study expands the topological material family on Si-containing compounds, which have great application potential in realizing low-cost, nontoxic electronic devices with topological quantum states.