Evidence of a topological edge state in a superconducting nonsymmorphic nodal-line semimetal

doi:10.1103/PhysRevB.103.L201109

	Evidence of a topological edge state in a superconducting nonsymmorphic nodal-line semimetal
	Xu, L. X.1,2,3; Xia, Y. Y. Y.1,4 ; Liu, S.1,3,5 ; Li, Y. W.1 ; Wei, L. Y.1 ; Wang, H. Y.1; Wang, C. W.1,2,3; Yang, H. F.1 ; Liang, A. J.1 ; Huang, K.1,2,3 ; Deng, T.1,4; Xia, W.1 ; Zhang, X.1 ; Zheng, H. J.6; Chen, Y. J.6; Yang, L. X.1; Wang, M. X.1 ; Guo, Y. F.1,4 ; Li, G.1,4 ; Liu, Z. K.1,4 ; Chen, Y. L.1,4,6,7
	2021-05-13
发表期刊	PHYSICAL REVIEW B
ISSN	2469-9950
EISSN	2469-9969
卷号	103 期号:20
DOI	10.1103/PhysRevB.103.L201109
摘要	Topological materials host fascinating low dimensional gapless states at the boundary. As a prominent example, helical topological edge states (TESs) of two-dimensional topological insulators and their stacked three-dimensional equivalent, weak topological insulators (WTIs), have sparked research enthusiasm due to their potential application in the next generation of electronics/spintronics with low dissipation. Here, we propose the layered superconducting material CaSn as a WTI with nontrivial Z(2) as well as nodal-line semimetal protected by crystalline nonsymmorphic symmetry. Our systematic angle-resolved photoemission spectroscopy (ARPES) investigation on the electronic structure exhibits excellent agreement with the calculation. Furthermore, scanning tunneling microscopy/spectroscopy (STM/STS) at the surface step edge shows signatures of the expected TES. These integrated evidences from ARPES, STM/STS measurement, and corresponding ab initio calculation strongly support the existence of TES in the nonsymmorphic nodal-line semimetal CaSn, which may become a versatile material platform to realize multiple exotic electronic states as well as topological superconductivity.
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收录类别	SCIE ; EI
语种	英语
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000655881300008
出版者	AMER PHYSICAL SOC
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/126935
专题	物质科学与技术学院_公共科研平台_拓扑物理实验室物质科学与技术学院_PI研究组_柳仲楷组物质科学与技术学院_PI研究组_郭艳峰组物质科学与技术学院_PI研究组_李刚组物质科学与技术学院_PI研究组_于奕组物质科学与技术学院_特聘教授组_陈宇林物质科学与技术学院_博士生信息科学与技术学院_PI研究组_刘松组大科学中心_公共科研平台_大科学装置建设部
通讯作者	Guo, Y. F.
作者单位	1.ShanghaiTech Univ, CAS Shanghai Sci Res Ctr, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China; 2.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 4.ShanghaiTech Lab Topol Phys, Shanghai 201210, Peoples R China; 5.Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China; 6.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China; 7.Univ Oxford, Dept Phys, Oxford OX1 3PU, England
第一作者单位	上海科技大学
通讯作者单位	上海科技大学
第一作者的第一单位	上海科技大学
推荐引用方式 GB/T 7714	Xu, L. X.,Xia, Y. Y. Y.,Liu, S.,et al. Evidence of a topological edge state in a superconducting nonsymmorphic nodal-line semimetal[J]. PHYSICAL REVIEW B,2021,103(20).
APA	Xu, L. X..,Xia, Y. Y. Y..,Liu, S..,Li, Y. W..,Wei, L. Y..,...&Chen, Y. L..(2021).Evidence of a topological edge state in a superconducting nonsymmorphic nodal-line semimetal.PHYSICAL REVIEW B,103(20).
MLA	Xu, L. X.,et al."Evidence of a topological edge state in a superconducting nonsymmorphic nodal-line semimetal".PHYSICAL REVIEW B 103.20(2021).