Consecutive topological transitions of helical Fermi arcs at saddle points in CoSi

Rao, Zhicheng1,2,3; Tian, Shangjie4,5; Gao, Shunye1,2,3; Hu, Quanxin1,2,3; Fan, Wenhui1,2,3; Huang, Jierui1,2,3; Tang, Cenyao1,2,3; Huang, Yaobo6; Lei, Hechang4,5; Sun, Yujie1,2,9; Qian, Tian1,2,7; Ding, Hong1,2,7,8

2022-05-01

10.1007/s11433-021-1867-y

Science China-Physics Mechanics & Astronomy   影响因子和分区

1674-7348

1869-1927

The CoSi family hosts unconventional topological nodes with nonzero Chem numbers. The nontrivial topology is manifested by conspicuous surface Fermi arcs connecting surface projections of the nodes. Here, using angle-resolved photoemission spectroscopy, we have systematically investigated the (001) surface states of pristine and Ni-doped CoSi. The surface states form saddle-like band structures at/near the time-reversal invariant point near the Fermi level. The Fermi arcs undergo consecutive Lifshitz transitions at the saddle points (X) over bar, leading to changes of the Fermi arc configuration. As the density of states has a van Hove singularity at the saddle points, exotic many-body physical phenomena may emerge accompanied by the topological transitions of surface Fermi arcs.

topological transition Fermi arcs saddle point

SCI ; EI

英语

通讯

Ministry of Science and Technology of China["2016YFA0401000","2016YFA0300600","2018YFE0202600","2016YFA0300504"] ; National Natural Science Foundation of China["U1832202",11774423,118224121,1888101] ; Chinese Academy of Sciences["QYZDB-SSW-SLH043","XDB33020100","XDB28000000"] ; Beijing Natural Science Foundation[Z200005] ; Research Funds of Renmin University of China["18XNLG14","19XNLG17"] ; Beijing Municipal Science and Technology Commission[Z171100002017018] ; Fundamental Research Funds for the Central Universities of Renmin University of China["18XNLG14","19XNLG17"]

Physics

Physics, Multidisciplinary

WOS:000777432300001

SCIENCE PRESS

20221411920735

Cobalt compounds ; Nickel compounds ; Photoelectron spectroscopy ; Silicon compounds ; Topology

Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Classical Physics; Quantum Theory; Relativity:931 ; High Energy Physics; Nuclear Physics; Plasma Physics:932

Web of Science

1.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China
5.Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China
6.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201210, Peoples R China
7.Songshan Lake Mat Lab, Dongguan 523808, Peoples R China
8.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China
9.South Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Rao, Zhicheng,Tian, Shangjie,Gao, Shunye,et al. Consecutive topological transitions of helical Fermi arcs at saddle points in CoSi[J]. Science China-Physics Mechanics & Astronomy,2022,65(5).

Rao, Zhicheng.,Tian, Shangjie.,Gao, Shunye.,Hu, Quanxin.,Fan, Wenhui.,...&Ding, Hong.(2022).Consecutive topological transitions of helical Fermi arcs at saddle points in CoSi.Science China-Physics Mechanics & Astronomy,65(5).

Rao, Zhicheng,et al."Consecutive topological transitions of helical Fermi arcs at saddle points in CoSi".Science China-Physics Mechanics & Astronomy 65.5(2022).