中国物理B ›› 2022, Vol. 31 ›› Issue (2): 27902-027902.doi: 10.1088/1674-1056/ac373c
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,†
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,†
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.
中图分类号: (Photoemission and photoelectron spectra)