Determination of the surface states from the ultrafast electronic states in a thermoelectric material

doi:10.1088/1674-1056/ac373c

中国物理B ›› 2022, Vol. 31 ›› Issue (2): 27902-027902.doi: 10.1088/1674-1056/ac373c

Determination of the surface states from the ultrafast electronic states in a thermoelectric material

Tongyao Wu(吴桐尧)¹, Hongyuan Wang(王洪远)², Yuanyuan Yang(杨媛媛)¹, Shaofeng Duan(段绍峰)¹, Chaozhi Huang(黄超之)¹, Tianwei Tang(唐天威)¹, Yanfeng Guo(郭艳峰)², Weidong Luo(罗卫东)³, and Wentao Zhang(张文涛)^1,†

1 Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
2 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;
3 Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China

收稿日期:2021-08-31 修回日期:2021-10-15 接受日期:2021-11-06 出版日期:2022-01-13 发布日期:2022-01-18
通讯作者: Wentao Zhang E-mail:wentaozhang@sjtu.edu.cn
基金资助:
W.T.Z. acknowledges support from the National Natural Science Foundation of China (Grant No. 11974243) and additional support from a Shanghai talent program. W.L. acknowledges support from the National Natural Science Foundation of China (Grant No. 11521404). Y.F.G. acknowledges the support by the Natural Science Foundation of Shanghai, China (Grant No. 17ZR1443300).

Determination of the surface states from the ultrafast electronic states in a thermoelectric material

1 Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
2 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;
3 Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2021-08-31 Revised:2021-10-15 Accepted:2021-11-06 Online:2022-01-13 Published:2022-01-18
Contact: Wentao Zhang E-mail:wentaozhang@sjtu.edu.cn
Supported by:
W.T.Z. acknowledges support from the National Natural Science Foundation of China (Grant No. 11974243) and additional support from a Shanghai talent program. W.L. acknowledges support from the National Natural Science Foundation of China (Grant No. 11521404). Y.F.G. acknowledges the support by the Natural Science Foundation of Shanghai, China (Grant No. 17ZR1443300).

摘要/Abstract

摘要： We reveal the electronic structure in YbCd₂Sb₂, a thermoelectric material, by angle-resolved photoemission spectroscopy (ARPES) and time-resolved ARPES (trARPES). Specifically, three bulk bands at the vicinity of the Fermi level are evidenced near the Brillouin zone center, consistent with the density functional theory (DFT) calculation. It is interesting that the spin-unpolarized bulk bands respond unexpectedly to right- and left-handed circularly polarized probe. In addition, a hole band of surface states, which is not sensitive to the polarization of the probe beam and is not expected from the DFT calculation, is identified. We find that the non-equilibrium quasiparticle recovery rate is much smaller in the surface states than that of the bulk states. Our results demonstrate that the surface states can be distinguished from the bulk ones from a view of time scale in the nonequilibrium physics.

关键词: electronic band structure, YbCd₂Sb₂, surface states, time- and angle-resolved photoemission spectroscopy

Abstract: We reveal the electronic structure in YbCd₂Sb₂, a thermoelectric material, by angle-resolved photoemission spectroscopy (ARPES) and time-resolved ARPES (trARPES). Specifically, three bulk bands at the vicinity of the Fermi level are evidenced near the Brillouin zone center, consistent with the density functional theory (DFT) calculation. It is interesting that the spin-unpolarized bulk bands respond unexpectedly to right- and left-handed circularly polarized probe. In addition, a hole band of surface states, which is not sensitive to the polarization of the probe beam and is not expected from the DFT calculation, is identified. We find that the non-equilibrium quasiparticle recovery rate is much smaller in the surface states than that of the bulk states. Our results demonstrate that the surface states can be distinguished from the bulk ones from a view of time scale in the nonequilibrium physics.

Key words: electronic band structure, YbCd₂Sb₂, surface states, time- and angle-resolved photoemission spectroscopy

中图分类号: (Photoemission and photoelectron spectra)

79.60.-i

71.15.-m (Methods of electronic structure calculations) 73.20.At (Surface states, band structure, electron density of states) 78.47.J- (Ultrafast spectroscopy (<1 psec))

Tongyao Wu(吴桐尧), Hongyuan Wang(王洪远), Yuanyuan Yang(杨媛媛), Shaofeng Duan(段绍峰), Chaozhi Huang(黄超之), Tianwei Tang(唐天威), Yanfeng Guo(郭艳峰), Weidong Luo(罗卫东), and Wentao Zhang(张文涛). Determination of the surface states from the ultrafast electronic states in a thermoelectric material[J]. 中国物理B, 2022, 31(2): 27902-027902.

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Determination of the surface states from the ultrafast electronic states in a thermoelectric material

Determination of the surface states from the ultrafast electronic states in a thermoelectric material

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