Surface-induced orbital-selective band reconstruction in kagome superconductor CsV3Sb5

doi:10.1088/1674-1056/ac4f50

中国物理B ›› 2022, Vol. 31 ›› Issue (5): 57403-057403.doi: 10.1088/1674-1056/ac4f50

所属专题： SPECIAL TOPIC — Superconductivity in vanadium-based kagome materials

Surface-induced orbital-selective band reconstruction in kagome superconductor CsV₃Sb₅

Linwei Huai(淮琳崴)^1,†, Yang Luo(罗洋)^1,†, Samuel M. L. Teicher², Brenden R. Ortiz², Kaize Wang(王铠泽)¹, Shuting Peng(彭舒婷)¹, Zhiyuan Wei(魏志远)¹, Jianchang Shen(沈建昌)¹, Bingqian Wang(王冰倩)¹, Yu Miao(缪宇)¹, Xiupeng Sun(孙秀鹏)¹, Zhipeng Ou(欧志鹏)¹, Stephen D. Wilson², and Junfeng He(何俊峰)^1,‡

1 CAS Key Laboratory of Strongly-coupled Quantum Matter Physics and Department of Physics, University of Science and Technology of China, Hefei 230026, China;
2 Materials Department and California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, California 93106, USA

收稿日期:2021-12-02 修回日期:2022-01-04 发布日期:2022-04-29
通讯作者: Junfeng He,E-mail:jfhe@ustc.edu.cn E-mail:jfhe@ustc.edu.cn
基金资助:
The work at University of Science and Technology of China (USTC) was supported by the Fundamental Research Funds for the Central Universities (Grant Nos.WK3510000008 and WK3510000012) and USTC start-up fund.Work at UC Santa Barbara was supported by the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under award DMR-1906325.This research made use of the shared facilities of the NSF Materials Research Science and Engineering Center at UC Santa Barbara (DMR-1720256).B.R.O.acknowledges support from the California NanoSystems Institute through the Elings Fellowship program.S.M.L.T has been supported by the National Science Foundation Graduate Research Fellowship Program under Grant No.DGE-1650114.

Surface-induced orbital-selective band reconstruction in kagome superconductor CsV₃Sb₅

1 CAS Key Laboratory of Strongly-coupled Quantum Matter Physics and Department of Physics, University of Science and Technology of China, Hefei 230026, China;
2 Materials Department and California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, California 93106, USA

Received:2021-12-02 Revised:2022-01-04 Published:2022-04-29
Contact: Junfeng He,E-mail:jfhe@ustc.edu.cn E-mail:jfhe@ustc.edu.cn
About author:2022-1-27
Supported by:
The work at University of Science and Technology of China (USTC) was supported by the Fundamental Research Funds for the Central Universities (Grant Nos.WK3510000008 and WK3510000012) and USTC start-up fund.Work at UC Santa Barbara was supported by the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under award DMR-1906325.This research made use of the shared facilities of the NSF Materials Research Science and Engineering Center at UC Santa Barbara (DMR-1720256).B.R.O.acknowledges support from the California NanoSystems Institute through the Elings Fellowship program.S.M.L.T has been supported by the National Science Foundation Graduate Research Fellowship Program under Grant No.DGE-1650114.

摘要/Abstract

摘要： The two-dimensional (2D) kagome superconductor CsV₃Sb₅ has attracted much recent attention due to the coexistence of superconductivity, charge orders, topology and kagome physics, which manifest themselves as distinct electronic structures in both bulk and surface states of the material. An interesting next step is to manipulate the electronic states in this system. Here, we report angle-resolved photoemission spectroscopy (ARPES) evidence for a surface-induced orbital-selective band reconstruction in CsV₃Sb₅. A significant energy shift of the electron-like band around Γ and a moderate energy shift of the hole-like band around M are observed as a function of time. This evolution is reproduced in a much shorter time scale by in-situ annealing of the CsV₃Sb₅ sample. Orbital-resolved density functional theory (DFT) calculations reveal that the momentum-dependent band reconstruction is associated with different orbitals for the bands around Γ and M, and the time-dependent evolution points to the change of sample surface that is likely caused by the formation of Cs vacancies on the surface. Our results indicate the possibility of orbital-selective control of the band structure via surface modification, which may open a new avenue for manipulating exotic phenomena in this material system, including superconductivity.

关键词: photoemission, kagome superconductor, band structure

Abstract: The two-dimensional (2D) kagome superconductor CsV₃Sb₅ has attracted much recent attention due to the coexistence of superconductivity, charge orders, topology and kagome physics, which manifest themselves as distinct electronic structures in both bulk and surface states of the material. An interesting next step is to manipulate the electronic states in this system. Here, we report angle-resolved photoemission spectroscopy (ARPES) evidence for a surface-induced orbital-selective band reconstruction in CsV₃Sb₅. A significant energy shift of the electron-like band around Γ and a moderate energy shift of the hole-like band around M are observed as a function of time. This evolution is reproduced in a much shorter time scale by in-situ annealing of the CsV₃Sb₅ sample. Orbital-resolved density functional theory (DFT) calculations reveal that the momentum-dependent band reconstruction is associated with different orbitals for the bands around Γ and M, and the time-dependent evolution points to the change of sample surface that is likely caused by the formation of Cs vacancies on the surface. Our results indicate the possibility of orbital-selective control of the band structure via surface modification, which may open a new avenue for manipulating exotic phenomena in this material system, including superconductivity.

Key words: photoemission, kagome superconductor, band structure

中图分类号: (Electronic structure (photoemission, etc.))

74.25.Jb

74.70.-b (Superconducting materials other than cuprates) 79.60.-i (Photoemission and photoelectron spectra) 74.20.Pq (Electronic structure calculations)

Linwei Huai(淮琳崴), Yang Luo(罗洋), Samuel M. L. Teicher, Brenden R. Ortiz, Kaize Wang(王铠泽),Shuting Peng(彭舒婷), Zhiyuan Wei(魏志远), Jianchang Shen(沈建昌), Bingqian Wang(王冰倩), Yu Miao(缪宇),Xiupeng Sun(孙秀鹏), Zhipeng Ou(欧志鹏), Stephen D. Wilson, and Junfeng He(何俊峰). Surface-induced orbital-selective band reconstruction in kagome superconductor CsV₃Sb₅[J]. 中国物理B, 2022, 31(5): 57403-057403.

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Surface-induced orbital-selective band reconstruction in kagome superconductor CsV₃Sb₅

Surface-induced orbital-selective band reconstruction in kagome superconductor CsV₃Sb₅

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