A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class

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題名:	A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class
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
關鍵詞:	Quantum Hall;Theoretical physics
日期:	2015-06-12
上傳時間:	2019-10-03 12:10:37 (UTC+8)
摘要:	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.
關聯:	Nature Communications 6, 7373
DOI:	10.1038/ncomms8373
顯示於類別:	[物理學系暨研究所] 期刊論文

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