title: Signature of type-II Weyl semimetal phase in MoTe2.
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 (MoTe2was discovered to be superconducting recently) and their topological order.
authors.affiliation: School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201203, People's Republic of China.|Department of Physics, University of Oxford, Oxford OX1 3PU, UK.|Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Korea.
authors.forename: J
authors.initials: J
authors.lastname: Jiang
authors.affiliation: School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201203, People's Republic of China.
authors.forename: Z K
authors.initials: ZK
authors.lastname: Liu
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Physics, University of Oxford, Oxford OX1 3PU, UK.|State Key Laboratory of Functional Materials for Informatics, SIMIT, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.
authors.forename: H F
authors.initials: HF
authors.lastname: Yang
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
authors.forename: C R
authors.initials: CR
authors.lastname: Rajamathi
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
authors.forename: Y P
authors.initials: YP
authors.lastname: Qi
authors.affiliation: State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics and Collaborative Innovation Center of Quantum Matter, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: L X
authors.initials: LX
authors.lastname: Yang
authors.affiliation: Department of Physics, University of Oxford, Oxford OX1 3PU, UK.
authors.forename: C
authors.initials: C
authors.lastname: Chen
authors.affiliation: Department of Physics, University of Oxford, Oxford OX1 3PU, UK.
authors.forename: H
authors.initials: H
authors.lastname: Peng
authors.affiliation: Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Korea.
authors.forename: C-C
authors.initials: CC
authors.lastname: Hwang
authors.affiliation: Hefei Science Center, CAS and SCGY, University of Science and Technology of China, Hefei 200026, People's Republic of China.
authors.forename: S Z
authors.initials: SZ
authors.lastname: Sun
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: S-K
authors.initials: SK
authors.lastname: Mo
authors.affiliation: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Trieste 34149, Italy.
authors.forename: I
authors.initials: I
authors.lastname: Vobornik
authors.affiliation: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Trieste 34149, Italy.
authors.forename: J
authors.initials: J
authors.lastname: Fujii
authors.affiliation: Max Planck Institute of Microstructure Physics, Halle D-06120, Germany.
authors.forename: S S P
authors.initials: SS
authors.lastname: Parkin
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Felser
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
authors.forename: B H
authors.initials: BH
authors.lastname: Yan
authors.affiliation: School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201203, People's Republic of China.|Department of Physics, University of Oxford, Oxford OX1 3PU, UK.|State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics and Collaborative Innovation Center of Quantum Matter, Tsinghua University, Beijing 100084, People's Republic of China.|Hefei Science Center, CAS and SCGY, University of Science and Technology of China, Hefei 200026, People's Republic of China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Chen