We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Observation of Weyl nodes in TaAs.
- Authors
Lv, B. Q.; Xu, N.; Weng, H. M.; Ma, J. Z.; Richard, P.; Huang, X. C.; Zhao, L. X.; Chen, G. F.; Matt, C. E.; Bisti, F.; Strocov, V. N.; Mesot, J.; Fang, Z.; Dai, X.; Qian, T.; Shi, M.; Ding, H.
- Abstract
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 in particle physics remains elusive after more than eight decades. Recently, significant advances in both topological insulators and topological semimetals have provided an alternative way to realize Weyl fermions in condensed matter, as an emergent phenomenon: when two non-degenerate bands in the three-dimensional momentum space cross in the vicinity of the Fermi energy (called Weyl nodes), the low-energy excitations behave exactly as Weyl fermions. Here we report the direct observation in TaAs of the long-sought-after Weyl nodes by performing bulk-sensitive soft X-ray angle-resolved photoemission spectroscopy measurements. The projected locations at the nodes on the (001) surface match well to the Fermi arcs, providing undisputable experimental evidence for the existence of Weyl fermionic quasiparticles in TaAs.
- Subjects
DIRAC equation; FERMIONS; PARTICLES (Nuclear physics); TOPOLOGICAL insulators; FERMI energy
- Publication
Nature Physics, 2015, Vol 11, Issue 9, p724
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys3426