globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2020.09.007
论文题名:
Anisotropic gapping of topological Weyl rings in the charge-density-wave superconductor InxTaSe2
作者: Li Y.; Wu Y.; Xu C.; Liu N.; Ma J.; Lv B.; Yao G.; Liu Y.; Bai H.; Yang X.; Qiao L.; Li M.; Li L.; Xing H.; Huang Y.; Ma J.; Shi M.; Cao C.; Liu Y.; Liu C.; Jia J.; Xu Z.-A.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期:3
起始页码: 243
结束页码: 249
语种: 英语
中文关键词: Charge density wave ; DFT calculations ; Nodal-line semimetal ; Superconductivity ; Weyl rings
英文关键词: Charge density ; Indium compounds ; Photoelectron spectroscopy ; Selenium compounds ; Shear waves ; Surface states ; Tantalum compounds ; Temperature ; Topology ; Transition metals ; Angle resolved photoemission spectroscopy ; Charge-density-wave superconductors ; Theoretical calculations ; Topological materials ; Topological phasis ; Transition metal dichalcogenides ; Unconventional superconductivity ; Upper critical fields ; Charge density waves
英文摘要: Topological materials and topological phases have recently become a hot topic in condensed matter physics. In this work, we report an In-intercalated transition-metal dichalcogenide InxTaSe2 (named 112 system), a topological nodal-line semimetal in the presence of both charge density wave (CDW) and superconductivity. In the x = 0.58 sample, the 2×3 commensurate CDW (CCDW) and the 2×2 CCDW are observed below 116 and 77 K, respectively. Consistent with theoretical calculations, the spin–orbital coupling gives rise to two twofold-degenerate nodal rings (Weyl rings) connected by drumhead surface states, confirmed by angle-resolved photoemission spectroscopy. Our results suggest that the 2×2 CCDW ordering gaps out one Weyl ring in accordance with the CDW band folding, while the other Weyl ring remains gapless with intact surface states. In addition, superconductivity emerges at 0.91 K, with the upper critical field deviating from the s-wave behavior at low temperature, implying possibly unconventional superconductivity. Therefore, we think this type of the 112 system may possess abundant physical states and offer a platform to investigate the interplay between CDW, nontrivial band topology and superconductivity. © 2020 Science China Press
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170321
Appears in Collections:气候变化与战略

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作者单位: Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, 310027, China; Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China; State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China; Shanghai Institute of Applied Physics, CAS, Shanghai, 201204, China; Paul Scherrer Institute, Swiss Light Source, Villigen PSI, CH-5232, Switzerland; Department of Physics, Hangzhou Normal University, Hangzhou, 310036, China; Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210093, China

Recommended Citation:
Li Y.,Wu Y.,Xu C.,et al. Anisotropic gapping of topological Weyl rings in the charge-density-wave superconductor InxTaSe2[J]. Science Bulletin,2021-01-01,66(3)
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