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Direct observation of sixfold exotic fermions in the pyrite-structured topological semimetal PdSb2 | |
2020-04-13 | |
发表期刊 | PHYSICAL REVIEW B |
ISSN | 2469-9950 |
EISSN | 2469-9969 |
卷号 | 101期号:15 |
发表状态 | 已发表 |
DOI | 10.1103/PhysRevB.101.155114 |
摘要 | Pyrite-structured PdSb2 with the nonsymmorphic crystalline symmetry, has long been predicted to host sixfold-degenerate exotic fermions beyond Dirac and Weyl. Although magnetotransport measurements on PdSb2 have suggested its topologically nontrivial character, the direct spectroscopic evidence still remains absent. By utilizing high-resolution angle-resolved photoemission spectroscopy, we present a systematic study on the low-energy bulk and surface electronic structure of pyrite-structured PdSb2. Through careful comparison with first-principles calculations, we verify the existence of sixfold fermions in this compound, which are formed by three doubly degenerate bands centered at the R point in the Brillouin zone. These bands exhibit parabolic dispersion close to sixfold fermion nodes, in sharp contrast to previously reported sixfold double spin-1 chiral fermions. Furthermore, our findings reveal no protected Fermi arcs in PdSb2, which is compatible with its achiral structure. Our findings suggest that pyrite-structured PdSb2 provides an ideal platform for the investigation of fermions and their potential applications. |
URL | 查看原文 |
收录类别 | SCI ; SCIE ; EI |
资助项目 | National Natural Science Foundation of China[11227902] |
WOS研究方向 | Materials Science ; Physics |
WOS类目 | Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
WOS记录号 | WOS:000525326300002 |
出版者 | AMER PHYSICAL SOC |
EI入藏号 | 20202008644260 |
EI主题词 | Antimony compounds ; Calculations ; Electronic structure ; Palladium compounds ; Photoelectron spectroscopy ; Pyrites ; Topology |
EI分类号 | Mathematics:921 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 |
WOS关键词 | DIRAC SEMIMETAL ; DISCOVERY |
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/119390 |
专题 | 物质科学与技术学院_硕士生 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_博士生 |
共同第一作者 | Hua, C. Q.; Liu, X. L. |
通讯作者 | Guo, Y. F. |
作者单位 | 1.Chinese Acad Sci, Ctr Excellence Superconducting Elect, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China 2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China 3.Zhejiang Univ, Dept Phys, Zhejiang Prov Key Lab Quantum Technol & Device, Hangzhou 310027, Peoples R China 4.Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China 5.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China |
通讯作者单位 | 物质科学与技术学院 |
推荐引用方式 GB/T 7714 | Sun, Z. P.,Hua, C. Q.,Liu, X. L.,et al. Direct observation of sixfold exotic fermions in the pyrite-structured topological semimetal PdSb2[J]. PHYSICAL REVIEW B,2020,101(15). |
APA | Sun, Z. P..,Hua, C. Q..,Liu, X. L..,Liu, Z. T..,Ye, M..,...&Shen, D. W..(2020).Direct observation of sixfold exotic fermions in the pyrite-structured topological semimetal PdSb2.PHYSICAL REVIEW B,101(15). |
MLA | Sun, Z. P.,et al."Direct observation of sixfold exotic fermions in the pyrite-structured topological semimetal PdSb2".PHYSICAL REVIEW B 101.15(2020). |
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