TY - JOUR
T1 - Nontrivial superconductivity in topological MoTe 2−x S x crystals
AU - Li, Yanan
AU - Gu, Qiangqiang
AU - Chen, Chen
AU - Zhang, Jun
AU - Liu, Qin
AU - Hu, Xiyao
AU - Liu, Jun
AU - Liu, Yi
AU - Ling, Langsheng
AU - Tian, Mingliang
AU - Wang, Yong
AU - Samarth, Nitin
AU - Li, Shiyan
AU - Zhang, Tong
AU - Feng, Ji
AU - Wang, Jian
N1 - Funding Information:
We thank Junyi Shan and Jiachen Li for the help with sample growth, and Shuang Jia for supply of X-ray diffractometer. We also thank Binghai Yan, Shengshan Qin, Jiangping Hu, Qiang Zhang, Ziqiao Wang, Yunjie Yu, and Yanzhao Liu for useful discussions. This work was supported by the National Basic Research Program of China (Grants 2018YFA0305600, 2016YFA0301004, 2016YFA0300200, 2015CB921700, 2017YFA0303302, 2013CB934600, and 2017YFA0303004), the National Natural Science Foundation of China (Grants 11774008 and 11725415), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB28000000), and the Science Challenge Project (Grant TZ2016004).
Funding Information:
ACKNOWLEDGMENTS. We thank Junyi Shan and Jiachen Li for the help with sample growth, and Shuang Jia for supply of X-ray diffractometer. We also thank Binghai Yan, Shengshan Qin, Jiangping Hu, Qiang Zhang, Ziqiao Wang, Yunjie Yu, and Yanzhao Liu for useful discussions. This work was supported by the National Basic Research Program of China (Grants 2018YFA0305600, 2016YFA0301004, 2016YFA0300200, 2015CB921700, 2017YFA0303302, 2013CB934600, and 2017YFA0303004), the National Natural Science Foundation of China (Grants 11774008 and 11725415), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB28000000), and the Science Challenge Project (Grant TZ2016004).
Publisher Copyright:
© 2018 National Academy of Sciences. All rights reserved.
PY - 2018/9/18
Y1 - 2018/9/18
N2 - Topological Weyl semimetals (TWSs) with pairs of Weyl points and topologically protected Fermi arc states have broadened the classification of topological phases and provide superior platform for study of topological superconductivity. Here we report the nontrivial superconductivity and topological features of sulfur-doped T d -phase MoTe 2 with enhanced T c compared with type-II TWS MoTe 2 . It is found that T d -phase S-doped MoTe 2 (MoTe 2 − x S x , x ∼ 0.2) is a two-band s-wave bulk superconductor (∼0.13 meV and 0.26 meV), where the superconducting behavior can be explained by the s +− pairing model. Further, measurements of the quasi-particle interference (QPI) patterns and a comparison with band-structure calculations reveal the existence of Fermi arcs in MoTe 2 − x S x . More interestingly, a relatively large superconducting gap (∼1.7 meV) is detected by scanning tunneling spectroscopy on the sample surface, showing a hint of topological nontrivial superconductivity based on the pairing of Fermi arc surface states. Our work demonstrates that the T d -phase MoTe 2 − x S x is not only a promising topological superconductor candidate but also a unique material for study of s + − superconductivity.
AB - Topological Weyl semimetals (TWSs) with pairs of Weyl points and topologically protected Fermi arc states have broadened the classification of topological phases and provide superior platform for study of topological superconductivity. Here we report the nontrivial superconductivity and topological features of sulfur-doped T d -phase MoTe 2 with enhanced T c compared with type-II TWS MoTe 2 . It is found that T d -phase S-doped MoTe 2 (MoTe 2 − x S x , x ∼ 0.2) is a two-band s-wave bulk superconductor (∼0.13 meV and 0.26 meV), where the superconducting behavior can be explained by the s +− pairing model. Further, measurements of the quasi-particle interference (QPI) patterns and a comparison with band-structure calculations reveal the existence of Fermi arcs in MoTe 2 − x S x . More interestingly, a relatively large superconducting gap (∼1.7 meV) is detected by scanning tunneling spectroscopy on the sample surface, showing a hint of topological nontrivial superconductivity based on the pairing of Fermi arc surface states. Our work demonstrates that the T d -phase MoTe 2 − x S x is not only a promising topological superconductor candidate but also a unique material for study of s + − superconductivity.
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U2 - 10.1073/pnas.1801650115
DO - 10.1073/pnas.1801650115
M3 - Article
C2 - 30166451
AN - SCOPUS:85053505951
SN - 0027-8424
VL - 115
SP - 9503
EP - 9508
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 38
ER -