Weak Electron-Phonon Coupling and Unusual Electron Scattering of Topological Surface States in Sb(111) by Laser-Based Angle-Resolved Photoemission Spectroscopy
XIE Zhuo-Jin1, HE Shao-Long1**, CHEN Chao-Yu1, FENG Ya1, YI He-Mian1, LIANG Ai-Ji1, ZHAO Lin1, MOU Dai-Xiang1, HE Jun-Feng1, PENG Ying-Ying1, LIU Xu1, LIU Yan1, LIU Guo-Dong1, DONG Xiao-Li1, YU Li1, ZHANG Jun1, ZHANG Shen-Jin3, WANG Zhi-Min3, ZHANG Feng-Feng3, YANG Feng3, PENG Qin-Jun3, WANG Xiao-Yang3, CHEN Chuang-Tian3, XU Zu-Yan3, ZHOU Xing-Jiang1,2**
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Collaborative Innovation Center of Quantum Matter, Beijing 100871 3Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190
Abstract：High-resolution laser-based angle-resolved photoemission (ARPES) measurements are carried out on Sb(111) single crystal. Two kinds of Fermi surface sheets are observed, which are derived from the topological surface states: one small hexagonal electron-like Fermi pocket around Γ point and the other six elongated lobes of hole-like Fermi pockets around the electron pocket. Clear Rashba-type band splitting due to the strong spin-orbit coupling is observed to be anisotropic in the momentum space. Our super-high-resolution ARPES measurements reveal no obvious kink in the surface band dispersions, indicating a weak electron-phonon interaction in the surface states. In particular, the electron scattering rate for these topological surface states is nearly a constant over a large energy window near the Fermi level that is unusual in terms of the conventional picture.
(Electron density of states and band structure of crystalline solids)
引用本文:
. [J]. 中国物理快报, 2014, 31(06): 67305-067305.
XIE Zhuo-Jin, HE Shao-Long, CHEN Chao-Yu, FENG Ya, YI He-Mian, LIANG Ai-Ji, ZHAO Lin, MOU Dai-Xiang, HE Jun-Feng, PENG Ying-Ying, LIU Xu, LIU Yan, LIU Guo-Dong, DONG Xiao-Li, YU Li, ZHANG Jun, ZHANG Shen-Jin, WANG Zhi-Min, ZHANG Feng-Feng, YANG Feng, PENG Qin-Jun, WANG Xiao-Yang, CHEN Chuang-Tian, XU Zu-Yan, ZHOU Xing-Jiang. Weak Electron-Phonon Coupling and Unusual Electron Scattering of Topological Surface States in Sb(111) by Laser-Based Angle-Resolved Photoemission Spectroscopy. Chin. Phys. Lett., 2014, 31(06): 67305-067305.
2014, Vol. 31 
