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Coexistence of tunable Weyl points and topological nodal lines in ternary transition-metal telluride TaIrT e 4

DOI: 10.1103/PhysRevB.97.241102 DOI Help

Authors: Xiaoqing Zhou (University of Colorado) , Qihang Liu (Southern University of Science and Technology of China) , Quansheng Wu (École Polytechnique Fédérale de Lausanne (EPFL)) , Tom Nummy (University of Colorado) , Haoxiang Li (University of Colorado Boulder) , Justin Griffith (University of Colorado) , Stephen Parham (University of Colorado) , Justin Waugh (University of Colorado Boulder) , Eve Emmanouilidou (University of California) , Bing Shen (University of California) , Oleg V. Yazyev (École Polytechnique Fédérale de Lausanne (EPFL)) , Ni Ni (University of California) , Daniel Dessau (University of Colorado)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 97

State: Published (Approved)
Published: June 2018
Diamond Proposal Number(s): 13406

Abstract: We report a combined theoretical and experimental study on TaIrTe4, a potential candidate for a minimal model of type-II Weyl semimetals. Unexpectedly, an intriguing node structure with 12 Weyl points and a pair of nodal lines protected by mirror symmetry was found by first-principles calculations. Some signatures of the complex electronic structure, such as topologically nontrivial band crossings and topologically trivial Fermi arcs, are cross-validated by angle-resolved photoemission spectroscopy. Through external strain, the number of Weyl points can be reduced to a theoretical minimum of four, and the appearance of the nodal lines can be switched between different mirror planes in momentum space. The coexistence of switchable Weyl points and nodal lines establishes transition-metal chalcogenides as a unique test ground for topological state characterization and engineering.

Journal Keywords: Topological materials; Topological phases of matter; Node-line semimetals; Noncentrosymmetric materials; Weyl semimetal; Angle-resolved photoemission spectroscopy; Density functional theory

Subject Areas: Materials, Physics


Instruments: I05-ARPES