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Observation of large topologically trivial Fermi arcs in the candidate type-II Weyl semimetal WTe2

F. Y. Bruno, A. Tamai, Q. S. Wu, I. Cucchi, C. Barreteau, A. de la Torre, S. McKeown Walker, S. Riccò, Z. Wang, T. K. Kim, M. Hoesch, M. Shi, N. C. Plumb, E. Giannini, A. A. Soluyanov, and F. Baumberger
Phys. Rev. B 94, 121112(R) – Published 14 September 2016
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    Abstract

    We report angle-resolved photoemission experiments resolving the distinct electronic structure of the inequivalent top and bottom (001) surfaces of WTe2. On both surfaces, we identify a surface state that forms a large Fermi arc emerging out of the bulk electron pocket. Using surface electronic structure calculations, we show that these Fermi arcs are topologically trivial and that their existence is independent of the presence of type-II Weyl points in the bulk band structure. This implies that the observation of surface Fermi arcs alone does not allow the identification of WTe2 as a topological Weyl semimetal. We further use the identification of the two different surfaces to clarify the number of Fermi surface sheets in WTe2.

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    • Received 8 April 2016

    DOI:https://doi.org/10.1103/PhysRevB.94.121112

    ©2016 American Physical Society

    Physics Subject Headings (PhySH)

    1. Physical Systems
    Weyl semimetal
    1. Techniques
    Angle-resolved photoemission spectroscopy
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    F. Y. Bruno1, A. Tamai1, Q. S. Wu2, I. Cucchi1, C. Barreteau1, A. de la Torre1, S. McKeown Walker1, S. Riccò1, Z. Wang1,3, T. K. Kim4, M. Hoesch4, M. Shi3, N. C. Plumb3, E. Giannini1, A. A. Soluyanov2,5, and F. Baumberger1,3

    • 1Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
    • 2Theoretical Physics and Station Q Zurich, ETH Zurich, 8093 Zurich, Switzerland
    • 3Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
    • 4Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
    • 5Department of Physics, St. Petersburg State University, St. Petersburg 199034, Russia

    See Also

    Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe2

    Yun Wu, Daixiang Mou, Na Hyun Jo, Kewei Sun, Lunan Huang, S. L. Bud'ko, P. C. Canfield, and Adam Kaminski
    Phys. Rev. B 94, 121113(R) (2016)

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    Issue

    Vol. 94, Iss. 12 — 15 September 2016

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    • Figure 1
      Figure 1

      (a) Side view of the crystal structure of WTe2. (b) Top and bottom view of the WTe2 lattice. The + and − (U and D) symbols denote the Te (W) atoms that are further away and closer to the mean position. (c) and (d) ARPES Fermi surface of WTe2 obtained with 6.01 eV excitation energy measured on two distinct surfaces parallel to the ab plane denoted as type A and type B, respectively. (e) and (f) Fermi surface contours extracted from measurements on samples type A and B, respectively. Measurements obtained with different polarizations are shown as different symbols, shaded blue and green areas denote the electron and hole pockets, and the surface state SS1 is shown in red. (g) and (h) Fermi surface calculated for a semi-infinite crystal for the inequivalent top and bottom surfaces.

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    • Figure 2
      Figure 2

      (a)–(c) Dispersion of the low-energy electronic states measured along the Γ-X direction on a type-A surface. (b)–(d) Same measurements on a type-B surface. (e) and (f) Extracted dispersion of the bands from measurements with different excitation energies and polarizations for surfaces of type A and B, respectively. The thick lines are a guide to the eyes. (g) Bulk band structure of WTe2 along Γ-X from density functional theory. (h)–(j) kz dispersion of the bulk electron pocket and surface state on a type-B surface measured at kx=0.36Å−1 and kx=0.3Å−1, respectively. (i) Constant energy surface measured at EF on a type-A surface.

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    • Figure 3
      Figure 3

      (a), (b) Momentum-resolved (001) surface density of states calculated along the Γ-X direction for the bottom surface of WTe2. The lattice parameters at T=113K and room temperature are used in (a) and (b), respectively, resulting in the presence of eight and zero Weyl points. (c) Fermi surface calculation of the WTe2 bottom surface. The top and bottom half correspond to the case of eight and zero Weyl points, respectively.

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