New type of Weyl semimetal with quadratic double Weyl fermions

Huang, Shin-Ming; Xu, Su-Yang; Belopolski, Ilya; Lee, Chi-Cheng; Chang, Guoqing; Chang, Tay-Rong; Wang, BaoKai; Alidoust, Nasser; Bian, Guang; Neupane, Madhab; Sanchez, Daniel; Zheng, Hao; Jeng, Horng-Tay; Bansil, Arun; Neupert, Titus; Lin, Hsin; Hasan, M. Zahid

doi:10.1073/pnas.1514581113

Title: New type of Weyl semimetal with quadratic double Weyl fermions

Journal Article · Tue Jan 19 00:00:00 EST 2016 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1514581113· OSTI ID:1236659

Huang, Shin-Ming ^[1]; Xu, Su-Yang ^[2]; Belopolski, Ilya ^[2]; Lee, Chi-Cheng ^[1]; Chang, Guoqing ^[1]; Chang, Tay-Rong ^[3]; Wang, BaoKai ^[4]; Alidoust, Nasser ^[2]; Bian, Guang ^[2]; Neupane, Madhab ^[2]; Sanchez, Daniel ^[2]; Zheng, Hao ^[2]; Jeng, Horng-Tay ^[5]; Bansil, Arun ^[6]; Neupert, Titus ^[7]; Lin, Hsin ^[1]; Hasan, M. Zahid ^[2]

Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546,, Department of Physics, National University of Singapore, Singapore 117542,
Joseph Henry Laboratory, Department of Physics, Princeton University, Princeton, NJ 08544,
Joseph Henry Laboratory, Department of Physics, Princeton University, Princeton, NJ 08544,, Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan,, Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544,
Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546,, Department of Physics, National University of Singapore, Singapore 117542,, Department of Physics, Northeastern University, Boston, MA 02115,
Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan,, Institute of Physics, Academia Sinica, Taipei 11529, Taiwan,
Department of Physics, Northeastern University, Boston, MA 02115,
Princeton Center for Theoretical Science, Princeton University, Princeton, NJ 08544

Weyl semimetals have attracted worldwide attention due to their wide range of exotic properties predicted in theories. The experimental realization had remained elusive for a long time despite much effort. Very recently, the first Weyl semimetal has been discovered in an inversion-breaking, stoichiometric solid TaAs. So far, the TaAs class remains the only Weyl semimetal available in real materials. To facilitate the transition of Weyl semimetals from the realm of purely theoretical interest to the realm of experimental studies and device applications, it is of crucial importance to identify other robust candidates that are experimentally feasible to be realized. In this paper, we propose such a Weyl semimetal candidate in an inversion-breaking, stoichiometric compound strontium silicide, SrSi₂, with many new and novel properties that are distinct from TaAs. Here, we show that SrSi₂ is a Weyl semimetal even without spin-orbit coupling and that, after the inclusion of spin-orbit coupling, two Weyl fermions stick together forming an exotic double Weyl fermion with quadratic dispersions and a higher chiral charge of ±2. Moreover, we find that the Weyl nodes with opposite charges are located at different energies due to the absence of mirror symmetry in SrSi₂, paving the way for the realization of the chiral magnetic effect. Finally, our systematic results not only identify a much-needed robust Weyl semimetal candidate but also open the door to new topological Weyl physics that is not possible in TaAs

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG-02-05ER46200; FG02-05ER46200; FG02-07ER46352; AC02-05CH11231

OSTI ID:: 1236659

Alternate ID(s):: OSTI ID: 1347702

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 113 Journal Issue: 5; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 251 works

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Title: New type of Weyl semimetal with quadratic double Weyl fermions

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