Electronic structure of correlated topological insulator candidate YbB6 studied by photoemission and quantum oscillation

doi:10.1088/1674-1056/ab6206

中国物理B ›› 2020, Vol. 29 ›› Issue (1): 17304-017304.doi: 10.1088/1674-1056/ab6206

所属专题： SPECIAL TOPIC — Topological semimetals

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Electronic structure of correlated topological insulator candidate YbB₆ studied by photoemission and quantum oscillation

T Zhang(张腾), G Li(李岗), S C Sun(孙淑翠), N Qin(秦娜), L Kang(康璐), S H Yao(姚淑华), H M Weng(翁红明), S K Mo, L Li(李璐), Z K Liu(柳仲楷), L X Yang(杨乐仙), Y L Chen(陈宇林)

1 State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;
2 Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA;
3 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
4 National Laboratory of Solid State Microstructures&Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;
5 Collaborative Innovation Center of Quantum Matter, Beijing, China;
6 Songshan Lake Materials Laboratory, Dongguan 523808, China;
7 CAS Center for Excellence in Topological Quantum Computation, Beijing 100190, China;
8 Physical Science Laboratory, Huairou National Comprehensive Science Center, Beijing 101400, China;
9 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;
10 School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China;
11 ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China;
12 Frontier Science Center for Quantum Information, Beijing 100084, China;
13 Department of Physics, Clarendon Laboratory, University of Oxford Parks Road, Oxford OX1 3PU, UK

收稿日期:2019-11-22 修回日期:2019-12-09 出版日期:2020-01-05 发布日期:2020-01-05
通讯作者: Y L Chen E-mail:yulin.chen@physics.ox.ac.uk

Electronic structure of correlated topological insulator candidate YbB₆ studied by photoemission and quantum oscillation

T Zhang(张腾)¹, G Li(李岗)^2,3, S C Sun(孙淑翠)¹, N Qin(秦娜)¹, L Kang(康璐)¹, S H Yao(姚淑华)⁴, H M Weng(翁红明)^3,5,6,7,8, S K Mo⁹, L Li(李璐)², Z K Liu(柳仲楷)^10,11, L X Yang(杨乐仙)^1,12, Y L Chen(陈宇林)^1,10,11,13

1 State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;
2 Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA;
3 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
4 National Laboratory of Solid State Microstructures&Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;
5 Collaborative Innovation Center of Quantum Matter, Beijing, China;
6 Songshan Lake Materials Laboratory, Dongguan 523808, China;
7 CAS Center for Excellence in Topological Quantum Computation, Beijing 100190, China;
8 Physical Science Laboratory, Huairou National Comprehensive Science Center, Beijing 101400, China;
9 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;
10 School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China;
11 ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China;
12 Frontier Science Center for Quantum Information, Beijing 100084, China;
13 Department of Physics, Clarendon Laboratory, University of Oxford Parks Road, Oxford OX1 3PU, UK

Received:2019-11-22 Revised:2019-12-09 Online:2020-01-05 Published:2020-01-05
Contact: Y L Chen E-mail:yulin.chen@physics.ox.ac.uk

摘要/Abstract

摘要： Angle-resolved photoemission spectroscopy (ARPES) and torque magnetometry (TM) measurements have been carried out to study the electronic structures of a correlated topological insulator (TI) candidate YbB₆. We observed clear surface states on the [001] surface centered at the Γ and M points of the surface Brillouin zone. Interestingly, the fermiology revealed by the quantum oscillation of TM measurements agrees excellently with ARPES measurements. Moreover, the band structures we observed suggest that the band inversion in YbB₆ happens between the Yb_5d and B_2p bands, instead of the Yb_5d and Yb_4f bands as suggested by previous theoretical investigation, which will help settle the heavy debate regarding the topological nature of samarium/ytterbium hexaborides.

关键词: topological insulator, electronic structure, surface states

Abstract: Angle-resolved photoemission spectroscopy (ARPES) and torque magnetometry (TM) measurements have been carried out to study the electronic structures of a correlated topological insulator (TI) candidate YbB₆. We observed clear surface states on the [001] surface centered at the Γ and M points of the surface Brillouin zone. Interestingly, the fermiology revealed by the quantum oscillation of TM measurements agrees excellently with ARPES measurements. Moreover, the band structures we observed suggest that the band inversion in YbB₆ happens between the Yb_5d and B_2p bands, instead of the Yb_5d and Yb_4f bands as suggested by previous theoretical investigation, which will help settle the heavy debate regarding the topological nature of samarium/ytterbium hexaborides.

Key words: topological insulator, electronic structure, surface states

中图分类号: (Surface states, band structure, electron density of states)

73.20.At

73.20.-r (Electron states at surfaces and interfaces) 71.27.+a (Strongly correlated electron systems; heavy fermions)

张腾, 李岗, 孙淑翠, 秦娜, 康璐, 姚淑华, 翁红明, S K Mo, 李璐, 柳仲楷, 杨乐仙, 陈宇林. Electronic structure of correlated topological insulator candidate YbB₆ studied by photoemission and quantum oscillation[J]. 中国物理B, 2020, 29(1): 17304-017304.

T Zhang(张腾), G Li(李岗), S C Sun(孙淑翠), N Qin(秦娜), L Kang(康璐), S H Yao(姚淑华), H M Weng(翁红明), S K Mo, L Li(李璐), Z K Liu(柳仲楷), L X Yang(杨乐仙), Y L Chen(陈宇林). Electronic structure of correlated topological insulator candidate YbB₆ studied by photoemission and quantum oscillation[J]. Chin. Phys. B, 2020, 29(1): 17304-017304.

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Electronic structure of correlated topological insulator candidate YbB₆ studied by photoemission and quantum oscillation

Electronic structure of correlated topological insulator candidate YbB₆ studied by photoemission and quantum oscillation

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