Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-00938-1
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Funding
- US National Science Foundation GRFP
- US National Science Foundation, Division of Materials Research [NSF-DMR-1507585, NSF-DMR-1006492]
- Gordon and Betty Moore Foundation through the EPIQS program grant [GBMF4547]
- Japan Society for the Promotion of Science, KAKENHI [26800165]
- Singapore National Research Foundation (NRF) under NRF RF Award [NRF-RF2013-08]
- MOE Tier 2 [MOE2016-T2-1-131, MOE2016-T2-2-153]
- Ministry of Science and Technology
- National Tsing Hua University
- National Cheng Kung University
- Academia Sinica, Taiwan
- Singapore NRF [NRF-NRFF2013-03]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1507585] Funding Source: National Science Foundation
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Through intense research on Weyl semimetals during the past few years, we have come to appreciate that typical Weyl semimetals host many Weyl points. Nonetheless, the minimum nonzero number of Weyl points allowed in a time-reversal invariant Weyl semimetal is four. Realizing such a system is of fundamental interest and may simplify transport experiments. Recently, it was predicted that TaIrTe4 realizes a minimal Weyl semimetal. However, the Weyl points and Fermi arcs live entirely above the Fermi level, making them inaccessible to conventional angle-resolved photoemission spectroscopy (ARPES). Here, we use pumpprobe ARPES to directly access the band structure above the Fermi level in TaIrTe4. We observe signatures of Weyl points and topological Fermi arcs. Combined with ab initio calculation, our results show that TaIrTe4 is a Weyl semimetal with the minimum number of four Weyl points. Our work provides a simpler platform for accessing exotic transport phenomena arising in Weyl semimetals.
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