Tunable double-Weyl Fermion semimetal state in the SrSi2 materials class

Bahadur Singh, Guoqing Chang, Tay Rong Chang, Shin Ming Huang, Chenliang Su, Ming Chieh Lin, Hsin Lin, Arun Bansil

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)

摘要

We discuss first-principles topological electronic structure of noncentrosymmetric SrSi2 materials class based on the hybrid exchange-correlation functional. Topological phase diagram of SrSi2 is mapped out as a function of the lattice constant with focus on the semimetal order. A tunable double-Weyl Fermion state in Sr1-x Ca x Si2 and Sr1-x Ba x Si2 alloys is identified. Ca doping in SrSi2 is shown to yield a double-Weyl semimetal with a large Fermi arc length, while Ba doping leads to a transition from the topological semimetal to a gapped insulator state. Our study indicates that SrSi2 materials family could provide an interesting platform for accessing the unique topological properties of Weyl semimetals.

原文English
文章編號10540
期刊Scientific reports
8
發行號1
DOIs
出版狀態Published - 2018 十二月 1

All Science Journal Classification (ASJC) codes

  • 多學科

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