Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2

@article{Deng2016ExperimentalOO,
  title={Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2},
  author={Ke Deng and Guoliang Wan and Peng Deng and Kenan Zhang and Shijie Ding and Eryin Wang and Mingzhe Yan and Huaqing Huang and Hongyun Zhang and Zhilin Xu and Jonathan D. Denlinger and Alexei V. Fedorov and Haitao Yang and Wenhui Duan and Hong Yao and Yang Wu and Shoushan Fan and Haijun Zhang and Xi Chen and Shuyun Zhou},
  journal={Nature Physics},
  year={2016},
  volume={12},
  pages={1105-1110}
}
Observations of topological surface states provide strong evidence that MoTe2 is a type-II Weyl semimetal, hosting Weyl fermions that have no counterpart in high-energy physics. 

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References

SHOWING 1-10 OF 44 REFERENCES
Topological States in Ferromagnetic CdO/EuO Quantum Well
Based on ab initio calculations, we demonstrate that the ferromagnetic CdO/EuO superlattice is a simple Weyl semimetal with two linear Weyl nodes in the Brillouin zone, and the corresponding CdO/EuO
Experimental discovery of Weyl semimetal TaAs
Weyl semimetals are a class of materials that can be regarded as three-dimensional analogs of graphene breaking time reversal or inversion symmetry. Electrons in a Weyl semimetal behave as Weyl
Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2.
TLDR
This work identifies the Weyl points and demonstrates that they are connected by different sets of Fermi arcs for each of the two surface terminations and finds new surface 'track states' that form closed loops and are unique to type II Weyl semimetals.
Bandgap opening in few-layered monoclinic MoTe2
Monoclinic transition metal dichalcogenides offer the possibility of topological quantum devices, but they are difficult to realize. One route may be through switching from the common hexagonal
MoTe_{2}: A Type-II Weyl Topological Metal.
TLDR
With no strain, the number of observable surface Fermi arcs in this material is 2-the smallest number of arcs consistent with time-reversal symmetry, opening a wide range of possible experimental realizations of different topological semimetal phases.
Universal signatures of Fermi arcs in quasiparticle interference on the surface of Weyl semimetals
Weyl semimetals constitute a newly discovered class of three-dimensional topological materials with linear touchings of valence and conduction bands in the bulk. The most striking property of
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.
Prediction of an arc-tunable Weyl Fermion metallic state in MoxW1−xTe2
TLDR
This work proposes a tunable Weyl state in MoxW1−xTe2 where Weyl nodes are formed by touching points between metallic pockets, and shows that the Fermi arc length can be changed as a function of Mo concentration, thus tuning the topological strength.
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.
MoTe2: Weyl and Line Node Topological Metal
Topological metals exhibit unremovable degeneracies in the band structure close to the Fermi level. These degeneracies can come in many types, the most basic of which are point (Weyl) and line nodes,
...
1
2
3
4
5
...