Weak Electron-Phonon Coupling and Unusual Electron Scattering of Topological Surface States in Sb(111) by Laser-Based Angle-Resolved Photoemission Spectroscopy

doi:10.1088/0256-307X/31/6/067305

Chin. Phys. Lett.

2014, Vol. 31

Issue (06): 067305 DOI: 10.1088/0256-307X/31/6/067305

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

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-Long^1**, 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-Jiang^1,2**

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

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XIE Zhuo-Jin, HE Shao-Long, CHEN Chao-Yu et al 2014 Chin. Phys. Lett. 31 067305

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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.

Published: 26 May 2014

PACS:	73.20.-r	(Electron states at surfaces and interfaces)
	79.60.-i	(Photoemission and photoelectron spectra)
	71.20.-b	(Electron density of states and band structure of crystalline solids)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/6/067305 OR https://cpl.iphy.ac.cn/Y2014/V31/I06/067305

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Articles by authors
	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

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