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

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [4];  [4];  [3];  [4];  [1]
  1. University of Colorado, Boulder, CO (United States)
  2. Southern University of Science and Technology (SUSTech), Shenzhen (China)
  3. Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
  4. University of California, Los Angeles, CA (United States)

Here 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.

Research Organization:
Univ. of Colorado, Boulder, CO (United States); Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Young 1000 Talents; Swiss National Science Foundation (SNSF)
Grant/Contract Number:
FG02-03ER46066; SC0011978; AC02-05CH11231
OSTI ID:
1540881
Alternate ID(s):
OSTI ID: 1441072
Journal Information:
Physical Review. B, Vol. 97, Issue 24; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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