Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8373
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Funding
- Gordon and Betty Moore Foundations EPiQS Initiative [GBMF4547]
- National Research Foundation, Prime Minister's Office, Singapore under its NRF fellowship (NRF) [NRF-NRFF2013-03]
- National Basic Research Program of China [2013CB921901, 2014CB239302]
- US DOE [DE-FG-02-05ER46200]
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-FG02-07ER46352]
- DOE [DE-AC02-05CH11231]
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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.
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