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Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb | |
Liang, A. J.1; Jiang, J.1,2,3; Wang, M. X.1; Sun, Y.4; Kumar, N.4; Shekhar, C.4; Chen, C.5; Peng, H.5; Wang, C. W.6; Xu, X.2,7,8 | |
2017-10-25 | |
发表期刊 | PHYSICAL REVIEW B |
ISSN | 2469-9950 |
卷号 | 96期号:16 |
发表状态 | 已发表 |
DOI | 10.1103/PhysRevB.96.165143 |
摘要 | Topological insulators represent unusual topological quantum states, typically with gapped bulk band structure but gapless surface Dirac fermions protected by time-reversal symmetry. Recently, a distinct kind of topological insulator resulting from nonsymmorphic crystalline symmetry was proposed in the KHgX (X = As, Sb, Bi) compounds. Unlike regular topological crystalline insulators, the nonsymmorphic glide-reflection symmetry in KHgX guarantees the appearance of an exotic surface fermion with hourglass shape dispersion (where two pairs of branches switch their partners) residing on its (010) side surface, contrasting to the usual two-dimensional Dirac fermion form. Here, by using high-resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structures of KHgSb on both (001) and (010) surfaces and reveal the unique in-gap surface states on the (010) surface with delicate dispersion consistent with the "hourglass Fermion" recently proposed. Our experiment strongly supports that KHgSb is a nonsymmorphic topological crystalline insulator with hourglass fermions, which serves as an important step to the discovery of unique topological quantum materials and exotic fermions protected by nonsymmorphic crystalline symmetry. |
收录类别 | SCI |
语种 | 英语 |
资助项目 | U.S. DOE, Office of Basic Energy Sciences[DE-AC02-05CH11231] |
WOS研究方向 | Materials Science ; Physics |
WOS类目 | Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
WOS记录号 | WOS:000413700500003 |
出版者 | AMER PHYSICAL SOC |
WOS关键词 | EXPERIMENTAL REALIZATION ; CRYSTALLINE INSULATOR ; MAJORANA FERMIONS ; DIRAC SEMIMETAL ; ARCS ; DISCOVERY ; PHASE |
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/9934 |
专题 | 生命科学与技术学院_硕士生 物质科学与技术学院_PI研究组_柳仲楷组 大科学中心_PI研究组_刘志组 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_硕士生 物质科学与技术学院_博士生 |
通讯作者 | Liu, Z. K. |
作者单位 | 1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 2.Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA 3.POSTECH, Pohang Accelerator Lab, Pohang 790784, South Korea 4.Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany 5.Univ Oxford, Dept Phys, Oxford OX1 3PU, England 6.Chinese Acad Sci, SIMIT, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China 7.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China 8.Tsinghua Univ, Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China 9.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 10.Collaborat Innovat Ctr Quantum Matter, Beijing 100190, Peoples R China |
第一作者单位 | 物质科学与技术学院 |
通讯作者单位 | 物质科学与技术学院 |
第一作者的第一单位 | 物质科学与技术学院 |
推荐引用方式 GB/T 7714 | Liang, A. J.,Jiang, J.,Wang, M. X.,et al. Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb[J]. PHYSICAL REVIEW B,2017,96(16). |
APA | Liang, A. J..,Jiang, J..,Wang, M. X..,Sun, Y..,Kumar, N..,...&Chen, Y. L..(2017).Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb.PHYSICAL REVIEW B,96(16). |
MLA | Liang, A. J.,et al."Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb".PHYSICAL REVIEW B 96.16(2017). |
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