Observation of Weyl nodes in TaAs
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Cites background from "Observation of Weyl nodes in TaAs"
...…as envisaged in (Halász and Balents, 2012; Murakami, 2007) reached fruition with the prediction and discovery of TaAs as a WSM (Huang et al., 2015a; Lv et al., 2015b,c; Weng et al., 2015a; Xu et al., 2015b) (and other members in this material class (Xu et al., 2016b, 2015a,c)), and the…...
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...If an odd number of surface states are encountered, and no bulk states, then one is required to have a nontrivial Chern number on the bulk Fermi surface enclosed by the curve (Belopolski et al., 2016c; Lv et al., 2015b) and hence we can define this as a “Weyl metal”....
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2,123 citations
Cites background from "Observation of Weyl nodes in TaAs"
...Recently, it has been experimentally shown that the Dirac semimetal is realized in Na3Bi (Liu et al., 2014e), while the Weyl semimetal is realized in TaAs (Lv et al., 2015; Xu et al., 2015c)....
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References
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Additional excerpts
...10 × 10 k-grid) describe the electronic structure accurately. The exchange-correlation functional within generalized gradient approximation parameterized by Perdew, Burke, and Ernzerhof has been used [32]. The optimized lattice constants a = b = 3.4824 Å, c = 11.8038 Å and atomic sites are in agreement with the experimental values. Acknowledgements We acknowledge the help in plotting Fig. 1 from Hu Mi...
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3,865 citations
"Observation of Weyl nodes in TaAs" refers background in this paper
...protection of crystal symmetry. An isolated Weyl node is a sink or source of gauge field of Berry curvature, like a monopole in momentum space, and the chirality corresponds to its topological charge [5, 6, 7]. Weyl nodes appear in pairs of opposite chirality in a real material due to the “No-go theorem” [8, 9]. To obtain isolated Weyl nodes, the spin degeneracy of the electronic bands has to be removed by...
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