journal article·2017-11-28

Visualizing Type-II Weyl Points in Tungsten Ditelluride by Quasiparticle Interference

Chun-Liang Lin, Ryuichi Arafune, Ro-Ya Liu, Masato Yoshimura, Baojie Feng, Kazuaki Kawahara, Zeyuan Ni, Emi Minamitani, Satoshi Watanabe, Youguo Shi, Maki Kawai, Tai-Chang Chiang, Iwao Matsuda, Noriaki Takagi

ACS Nano· Volume 11· Issue 11
Publisher page

Abstract

Weyl semimetals (WSMs) are classified into two types, type I and II, according to the topology of the Weyl point, where the electron and hole pockets touch each other. Tungsten ditelluride (WTe 2 ) has garnered a great deal of attention as a strong candidate to be a type-II WSM. However, the Weyl points for WTe 2 are located above the Fermi level, which has prevented us from identifying the locations and the connection to the Fermi arc surface states by using angle-resolved photoemission spectroscopy. Here, we present experimental proof that WTe 2 is a type-II WSM. We measured energy-dependent quasiparticle interference patterns with a cryogenic scanning tunneling microscope, revealing the position of the Weyl point and its connection with the Fermi arc surface states, in agreement with prior theoretical predictions. Our results provide an answer to this crucial question and stimulate further exploration of the characteristics of WSMs.
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Research context

OpenAlex topics: Topological Materials and Phenomena · 2D Materials and Applications · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan

International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan

Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Department of Physics, University of Illinois, Urbana, Illinois 61801, United States

Funding

Ministry of Education, Culture, Sports, Science and Technology · Japan Society for the Promotion of Science · Office of Science

References (35)

Show source-provided references
1. 10.1038/nature0684310.1038/nature06843 ↗
2. 10.1038/nphys127010.1038/nphys1270 ↗
3. 10.1103/PhysRevLett.104.06700110.1103/PhysRevLett.104.067001 ↗
4. 10.1103/RevModPhys.83.105710.1103/RevModPhys.83.1057 ↗
5. 10.1126/science.125674210.1126/science.1256742 ↗
6. 10.1103/PhysRevB.83.20510110.1103/PhysRevB.83.205101 ↗
7. 10.1126/science.aaa929710.1126/science.aaa9297 ↗
8. 10.1038/nphys343710.1038/nphys3437 ↗
9. 10.1103/PhysRevB.93.16111210.1103/PhysRevB.93.161112 ↗
10. 10.1038/nature1576810.1038/nature15768 ↗
11. 10.1103/PhysRevLett.116.06660110.1103/PhysRevLett.116.066601 ↗
12. 10.1126/sciadv.160070910.1126/sciadv.1600709 ↗
13. 10.1103/PhysRev.159.110610.1103/PhysRev.159.1106 ↗
14. 10.1103/PhysRevD.58.11600210.1103/PhysRevD.58.116002 ↗
15. 10.1103/PhysRevLett.97.04180110.1103/PhysRevLett.97.041801 ↗
16. 10.1038/nature1376310.1038/nature13763 ↗
17. 10.1038/nmat468510.1038/nmat4685 ↗
18. 10.1038/nphys387110.1038/nphys3871 ↗
19. 10.1038/ncomms1063910.1038/ncomms10639 ↗
20. 10.1038/ncomms1364310.1038/ncomms13643 ↗
21. 10.1103/PhysRevLett.115.16660110.1103/PhysRevLett.115.166601 ↗
22. 10.1038/ncomms1084710.1038/ncomms10847 ↗
23. 10.1103/PhysRevB.94.12111210.1103/PhysRevB.94.121112 ↗
24. 10.1103/PhysRevB.94.12111310.1103/PhysRevB.94.121113 ↗
25. 10.1103/PhysRevB.94.16140110.1103/PhysRevB.94.161401 ↗
26. 10.1103/PhysRevB.94.19513410.1103/PhysRevB.94.195134 ↗
27. 10.1021/acsnano.5b0680710.1021/acsnano.5b06807 ↗
28. 10.1103/PhysRevB.93.04110910.1103/PhysRevB.93.041109 ↗
29. 10.1103/PhysRevB.93.03513710.1103/PhysRevB.93.035137 ↗
30. 10.1103/PhysRevLett.117.26680410.1103/PhysRevLett.117.266804 ↗
31. 10.1103/PhysRevB.54.1116910.1103/PhysRevB.54.11169 ↗
32. 10.1016/0927-0256(96)00008-010.1016/0927-0256(96)00008-0 ↗
33. 10.1103/PhysRevB.50.1795310.1103/PhysRevB.50.17953 ↗
34. 10.1103/PhysRevLett.77.386510.1103/PhysRevLett.77.3865 ↗
35. 10.1021/ja00049a02910.1021/ja00049a029 ↗