TY - JOUR
T1 - Evidence for topological type-II Weyl semimetal WTe2
AU - Li, Peng
AU - Wen, Yan
AU - He, Xin
AU - Zhang, Qiang
AU - Xia, Chuan
AU - Yu, Zhi-Ming
AU - Yang, Shengyuan A.
AU - Zhu, Zhiyong
AU - Alshareef, Husam N.
AU - Zhang, Xixiang
N1 - KAUST Repository Item: Exported on 2020-04-23
Acknowledgements: We’d like to thank Prof. Xi Dai, institute of Physics (Beijing), for his critical reading and useful discussion in the revision of the manuscript. We thank Y. Yang for the assistance on polarized Raman, and Z. P. Hou for the useful discussion. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). P.L. acknowledges the financial support of CRF-2015-SENSORS-2709 (KAUST).
PY - 2017/12/15
Y1 - 2017/12/15
N2 - Recently, a type-II Weyl fermion was theoretically predicted to appear at the contact of electron and hole Fermi surface pockets. A distinguishing feature of the surfaces of type-II Weyl semimetals is the existence of topological surface states, so-called Fermi arcs. Although WTe2 was the first material suggested as a type-II Weyl semimetal, the direct observation of its tilting Weyl cone and Fermi arc has not yet been successful. Here, we show strong evidence that WTe2 is a type-II Weyl semimetal by observing two unique transport properties simultaneously in one WTe2 nanoribbon. The negative magnetoresistance induced by a chiral anomaly is quite anisotropic in WTe2 nanoribbons, which is present in b-axis ribbon, but is absent in a-axis ribbon. An extra-quantum oscillation, arising from a Weyl orbit formed by the Fermi arc and bulk Landau levels, displays a two dimensional feature and decays as the thickness increases in WTe2 nanoribbon.
AB - Recently, a type-II Weyl fermion was theoretically predicted to appear at the contact of electron and hole Fermi surface pockets. A distinguishing feature of the surfaces of type-II Weyl semimetals is the existence of topological surface states, so-called Fermi arcs. Although WTe2 was the first material suggested as a type-II Weyl semimetal, the direct observation of its tilting Weyl cone and Fermi arc has not yet been successful. Here, we show strong evidence that WTe2 is a type-II Weyl semimetal by observing two unique transport properties simultaneously in one WTe2 nanoribbon. The negative magnetoresistance induced by a chiral anomaly is quite anisotropic in WTe2 nanoribbons, which is present in b-axis ribbon, but is absent in a-axis ribbon. An extra-quantum oscillation, arising from a Weyl orbit formed by the Fermi arc and bulk Landau levels, displays a two dimensional feature and decays as the thickness increases in WTe2 nanoribbon.
UR - http://hdl.handle.net/10754/626408
UR - https://www.nature.com/articles/s41467-017-02237-1
UR - http://www.scopus.com/inward/record.url?scp=85038227674&partnerID=8YFLogxK
U2 - 10.1038/s41467-017-02237-1
DO - 10.1038/s41467-017-02237-1
M3 - Article
C2 - 29247186
AN - SCOPUS:85038227674
VL - 8
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
ER -