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*

*此作品的通信作者

研究成果: Article同行評審

39 引文 斯高帕斯(Scopus)

摘要

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 (WTe2) has garnered a great deal of attention as a strong candidate to be a type-II WSM. However, the Weyl points for WTe2 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 WTe2 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.

原文English
頁(從 - 到)11459-11465
頁數7
期刊ACS Nano
11
發行號11
DOIs
出版狀態Published - 28 11月 2017

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