Experimental Investigation of Electronic Structure of La（O,F）BiSe2

La（O,F）BiSe2 is a layered superconductor and has the same crystal structure with La（O,F）BiS2. We investigate the electronic structure of La（O,F）BiSe2 using the angle-resolved photoemission spectroscopy. Two electron-like Fermi surfaces around X（π, 0） are observed, corresponding to the electron dopin...

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Published in:中国物理快报：英文版 2016, Vol.33 (12), p.120-123
Main Author: 马俊 付彬彬 马均章 孔令元 陈迪 邵继峰 张昌锦 钱天 张裕恒 丁洪
Format: Article
Language:English
Subjects:
实验
层状超导体
晶体结构
电子结构
自旋-轨道耦合
表面状态
角分辨光电子能谱
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Summary:La（O,F）BiSe2 is a layered superconductor and has the same crystal structure with La（O,F）BiS2. We investigate the electronic structure of La（O,F）BiSe2 using the angle-resolved photoemission spectroscopy. Two electron-like Fermi surfaces around X（π, 0） are observed, corresponding to the electron doping of 0.23 per Bi site. We clearly resolve anisotropic band splitting along both Г-X and M-X due to the cooperative effects of large spin-orbit coupling and interlayer coupling. Moreover, we observe an almost non-dispersive electronic state around -0.2 eV between the electron-like bands. This state vanishes after in-situ K evaporation, indicating that it could be the localized surface state caused by defects on the cleaved surface.
ISSN:0256-307X
1741-3540