A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class.
A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class.
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DOI:
10.1038/ncomms8373
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发表时间:
2015-06-12
影响因子:
16.6
通讯作者:
Hasan, M. Zahid
中科院分区:
文献类型:
--
作者:
Huang, Shin-Ming;Xu, Su-Yang;Belopolski, Ilya;Lee, Chi-Cheng;Chang, Guoqing;Wang, BaoKai;Alidoust, Nasser;Bian, Guang;Neupane, Madhab;Zhang, Chenglong;Jia, Shuang;Bansil, Arun;Lin, Hsin;Hasan, M. Zahid
Weyl fermions are massless chiral fermions that play an important role in quantum field theory but have never been observed as fundamental particles. A Weyl semimetal is an unusual crystal that hosts Weyl fermions as quasiparticle excitations and features Fermi arcs on its surface. Such a semimetal not only provides a condensed matter realization of the anomalies in quantum field theories but also demonstrates the topological classification beyond the gapped topological insulators. Here, we identify a topological Weyl semimetal state in the transition metal monopnictide materials class. Our first-principles calculations on TaAs reveal its bulk Weyl fermion cones and surface Fermi arcs. Our results show that in the TaAs-type materials the Weyl semimetal state does not depend on fine-tuning of chemical composition or magnetic order, which opens the door for the experimental realization of Weyl semimetals and Fermi arc surface states in real materials. Proposals for the realization of Weyl semimetals, topologically non-trivial materials which host Weyl fermion quasiparticles, have faced demanding experimental requirements. Here, the authors predict such a state in stoichiometric TaAs, arising due to the breaking of inversion symmetry.
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