Experimental discovery of Weyl semimetal TaAs

By Xianhui Chen. Science China Materials, 2015

1,757 citations recorded by the source corpus.

In 1929, H. Weyl proposed that the massless solution of the Dirac equation represents a pair of a new type of particles, the so-called Weyl fermions. However, their existence as a fundamental particle remains evasive after more than eight decades. Neutrinos were once considered to be Weyl fermions until its mass was found. Recently, it was proposed that Weyl fermions can be hosted in a class of exotic condensed matter, so called Weyl semimetal (WSM), as quasiparticles of its low-energy excitation when two non-degenerate bands cross near the Fermi level in three-dimensional momentum space. The crossing point is called Weyl node. A Weyl node is a singularity point of the Berry curvature, which can be viewed as a magnetic monopole in momentum space. These WSMs possess pairs of Weyl nodes with opposite chirality in the bulk. One of the hallmarks in a WSM is the emergence of surface Fermi arcs, which connect the projections of Weyl nodes with opposite chiral charge on the surface.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/048aafbe383d2a0d99c27e612cea7243b2ceb52c

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Citations in the corpus

Nodal-link semimetals (2017, background): “[33] BQ Lv, HM Weng, BB Fu, XP Wang, H Miao, J Ma, P Richard, XC Huang, LX Zhao, GF Chen, et al.”
Transport in inhomogeneous quantum critical fluids and in the Dirac fluid in graphene (2015, background): “interacting three dimensional materials including Weyl semimetals [50, 51, 52] may also give rise to novel phenomena relevant for transport [53, 54].”
Weyl and Dirac semimetals in three-dimensional solids (2017, methodology): “…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…”
A complete catalogue of high-quality topological materials (2018, neutral): “Z4 79 (2), 1 (10), 83 (11), 315 (12), 10 (13), 62 (14), 82 (15), 10 (47), 15 (51), 2 (53), 53 (55), 7 (57), 12 (58), 26 (59), 7 (60), 2 (61), 257 (62), 189 (63), 25 (64), 47 (65), 1 (67), 18 (69), 23 (70), 86 (71), 9 (72), 20 (74), 1 (83), 1 (85), 8 (87), 42 (123), 1 (125), 30 (127), 1 (128), 162 (1”
Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP (2015, positive): “Extensive ARPES studies have shown the existence of Fermi-arc surface states and linear band crossings in the bulk band structure of all four materials from the TaAs family 7–9, 32, 33 .”