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Observation of large topologically trivial Fermi arcs in the candidate type-II Weyl semimetal WT e 2

DOI: 10.1103/PhysRevB.94.121112 DOI Help

Authors: F. Y. Bruno (Department of Quantum Matter Physics, University of Geneva) , A. Tamai (University of Geneva) , Q. S. Wu (Theoretical Physics and Station Q Zurich) , I. Cucchi (University of Geneva) , C. Barreteau (Department of Quantum Matter Physics, University of Geneva) , A. De La Torre (University of Geneva) , S. Mckeown Walker (University of Geneva) , S. Ricco (University of Geneva) , Z. Wang (University of Geneva; Swiss Light Source, Paul Scherrer Institute) , T. K. Kim (Diamond Light Source) , M. Hoesch (Diamond Light Source) , M. Shi (Swiss Light Source, Paul Scherrer Institute) , N. C. Plumb (Swiss Light Source, Paul Scherrer Institute) , E. Giannini (University of Geneva) , A. A. Soluyanov (Theoretical Physics and Station Q Zurich; St. Petersburg State University) , F. Baumberger (University of Geneva)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 94

State: Published (Approved)
Published: September 2016
Diamond Proposal Number(s): 12404

Abstract: We report angle-resolved photoemission experiments resolving the distinct electronic structure of the inequivalent top and bottom (001) surfaces of WTe 2 . 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 WTe 2 as a topological Weyl semimetal. We further use the identification of the two different surfaces to clarify the number of Fermi surface sheets in WTe 2.

Subject Areas: Physics, Materials, Energy

Instruments: I05-ARPES

Other Facilities: Swiss Light Source

Added On: 26/09/2016 08:29

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