Weyl semimetals, Fermi arcs and chiral anomalies.

@article{Jia2016WeylSF,
  title={Weyl semimetals, Fermi arcs and chiral anomalies.},
  author={Shuang Jia and Su-Yang Xu and M Zahid Hasan},
  journal={Nature materials},
  year={2016},
  volume={15 11},
  pages={
          1140-1144
        }
}
Physicists have discovered a new topological phase of matter, the Weyl semimetal, whose surface features a non-closed Fermi surface whereas the low-energy quasiparticles in the bulk emerge as Weyl fermions. A brief review of these developments and perspectives on the next steps forward are presented. 
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References

SHOWING 1-10 OF 35 REFERENCES
A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class
TLDR
The results show that in the TaAs-type materials the WeylSemimetal 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.
Discovery of a Weyl fermion semimetal and topological Fermi arcs
TLDR
The experimental discovery of a Weyl semimetal, tantalum arsenide (TaAs), using photoemission spectroscopy, which finds that Fermi arcs terminate on the Weyl fermion nodes, consistent with their topological character.
Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals.
TLDR
It is shown that it is unreasonable to directly observe Fermi arcs in NbP by ARPES within available experimental resolution and spectral linewidth, and rigorously demonstrate a nonzero Chern number in TaAs by counting chiral edge modes on a closed loop.
Type-II Weyl semimetals
TLDR
This work proposes the existence of a previously overlooked type of Weyl fermion that emerges at the boundary between electron and hole pockets in a new phase of matter and discovers a type-II Weyl point, which is still a protected crossing, but appears at the contact of electron and Hole pockets in type- II Weyl semimetals.
Chern semimetal and the quantized anomalous Hall effect in HgCr2Se4.
TLDR
It is predicted, based on first principles calculations, that such a novel quantum state can be realized in a known ferromagnetic compound HgCr2Se4, with a single pair of Weyl fermions separated in momentum space.
Discovery of a Weyl fermion state with Fermi arcs in niobium arsenide
Three types of fermions play a fundamental role in our understanding of nature: Dirac, Majorana and Weyl. Whereas Dirac fermions have been known for decades, the latter two have not been observed as
Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal
TLDR
Signs of the Weyl fermion chiral anomaly in the magneto-transport of TaAs are reported and it is observed that high mobility TaAs samples become more conductive as a magnetic field is applied along the direction of the current for certain ranges of the field strength.
Quantum oscillations from surface Fermi arcs in Weyl and Dirac semimetals.
TLDR
It is found that the open Fermi arcs participate in unusual closed magnetic orbits by traversing the bulk of the sample to connect opposite surfaces, and result in quantum oscillations that contain observable signatures of the topological character of the bulk Weyl semimetal.
Weyl semimetal in a topological insulator multilayer.
TLDR
The Weyl semimetal has a nonzero dc conductivity at zero temperature, but Drude weight vanishing as T(2), and is thus an unusual metallic phase, characterized by a finite anomalous Hall conductivity and topologically protected edge states.
Observation of Weyl nodes in TaAs
Experiments show that TaAs is a three-dimensional topological Weyl semimetal. In 1929, H. Weyl proposed that the massless solution of the Dirac equation represents a pair of a new type of particles,
...
1
2
3
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...