Signature of type-II Weyl semimetal phase in MoTe2

J. Jiang, Z.K. Liu, Y. Sun, H.F. Yang, C.R. Rajamathi, Y.P. Qi, L.X. Yang, C. Chen, H. Peng, C-C. Hwang, S.Z. Sun, S-K. Mo, I. Vobornik, J. Fujii, S.S.P. Parkin, C. Felser, B.H. Yan and Y.L. Chen ()
Additional contact information
J. Jiang: School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center
Z.K. Liu: School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center
Y. Sun: Max Planck Institute for Chemical Physics of Solids
H.F. Yang: University of Oxford
C.R. Rajamathi: Max Planck Institute for Chemical Physics of Solids
Y.P. Qi: Max Planck Institute for Chemical Physics of Solids
L.X. Yang: State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University
C. Chen: University of Oxford
H. Peng: University of Oxford
C-C. Hwang: Pohang Accelerator Laboratory, POSTECH
S.Z. Sun: Hefei Science Center, CAS and SCGY, University of Science and Technology of China
S-K. Mo: Advanced Light Source, Lawrence Berkeley National Laboratory
I. Vobornik: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC
J. Fujii: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC
S.S.P. Parkin: Max Planck Institute of Microstructure Physics
C. Felser: Max Planck Institute for Chemical Physics of Solids
B.H. Yan: Max Planck Institute for Chemical Physics of Solids
Y.L. Chen: School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Topological Weyl semimetal (TWS), a new state of quantum matter, has sparked enormous research interest recently. Possessing unique Weyl fermions in the bulk and Fermi arcs on the surface, TWSs offer a rare platform for realizing many exotic physical phenomena. TWSs can be classified into type-I that respect Lorentz symmetry and type-II that do not. Here, we directly visualize the electronic structure of MoTe2, a recently proposed type-II TWS. Using angle-resolved photoemission spectroscopy (ARPES), we unravel the unique surface Fermi arcs, in good agreement with our ab initio calculations that have nontrivial topological nature. Our work not only leads to new understandings of the unusual properties discovered in this family of compounds, but also allows for the further exploration of exotic properties and practical applications of type-II TWSs, as well as the interplay between superconductivity (MoTe2 was discovered to be superconducting recently) and their topological order.

Date: 2017
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DOI: 10.1038/ncomms13973

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