New type of Weyl semimetal with quadratic double Weyl fermions

Proceedings of the National Academy of Sciences of the United States of America
Shin-Ming HuangM Zahid Hasan

Abstract

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. 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 mi...Continue Reading

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Citations

Oct 26, 2016·Nature Materials·Lunan HuangAdam Kaminski
Jan 12, 2017·Nature Communications·Motoaki HirayamaShuichi Murakami
Jul 7, 2017·Nature Communications·Fernando de JuanJoel E Moore
Feb 21, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D A Pshenay-SeverinA T Burkov
Aug 31, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yong Sun, Anmin Wang
Jan 12, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Paromita Dutta, Sudhir K Pandey
Apr 4, 2019·Physical Chemistry Chemical Physics : PCCP·Z C ZouL Z Sun
Oct 26, 2016·Nature Materials·Shuang JiaM Zahid Hasan
Oct 1, 2016·Scientific Reports·Seongjin AhnHongki Min
Oct 2, 2019·Nanoscale·Lijun MengRudolf A Römer
Sep 28, 2017·Physical Review Letters·P RinkelIon Garate
Aug 5, 2017·Physical Review Letters·J F SteinerD A Pesin
May 26, 2018·Physical Review Letters·Julia M LinkJörg Schmalian
Jan 11, 2020·Physical Review Letters·O Matsyshyn, I Sodemann
Jul 14, 2018·Scientific Reports·Bahadur SinghArun Bansil
Oct 28, 2017·Physical Review Letters·Guoqing ChangM Zahid Hasan
Jan 20, 2018·Physical Review Letters·Tiantian ZhangZhong Fang
Aug 28, 2019·Materials·Dmitry A Pshenay-Severin, Alexander T Burkov
Oct 19, 2017·Nature Communications·Ilya BelopolskiM Zahid Hasan
Apr 9, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Željana Bonačić Lošić
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Jun 16, 2021·Nature Materials·Qiong MaKenneth S Burch
Apr 30, 2019·The Journal of Physical Chemistry Letters·Hongbo WuYugui Yao

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