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

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13 Citations (Scopus)


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.

Original languageEnglish
Article number10540
JournalScientific reports
Issue number1
Publication statusPublished - 2018 Dec 1

All Science Journal Classification (ASJC) codes

  • General

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