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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Coexistence of tunable Weyl points and topological nodal lines in ternary transition-metal telluride TaIrT e 4 Xiaoqing Zhou , Qihang Liu , Quansheng Wu , Tom Nummy , Haoxiang Li , Justin Griffith , Stephen Parham , Justin Waugh , Eve Emmanouilidou , Bing Shen , Oleg V. Yazyev , Ni Ni , Daniel Dessau Physical Review B 97 DOI: 10.1103/PhysRevB.97.241102 Diamond Proposal Number(s): [13406] Show Abstract ▼ 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.	Jun 2018

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