| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Experimental Investigation of Electronic Structure of La(O,F)BiSe$_{2}$ |
| Jun Ma1, Bin-Bin Fu1, Jun-Zhang Ma1, Ling-Yuan Kong1, Di Chen1, Ji-Feng Shao3, Chang-Jin Zhang3, Tian Qian1,2, Yu-Heng Zhang3, Hong Ding1,2** |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Collaborative Innovation Center of Quantum Matter, Beijing 100190
3High Magnetic field Laboratory of Chinese Academy of Sciences, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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Jun Ma, Bin-Bin Fu, Jun-Zhang Ma et al 2016 Chin. Phys. Lett. 33 127401 |
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Abstract La(O,F)BiSe$_{2}$ is a layered superconductor and has the same crystal structure with La(O,F)BiS$_{2}$. We investigate the electronic structure of La(O,F)BiSe$_{2}$ using the angle-resolved photoemission spectroscopy. Two electron-like Fermi surfaces around $X(\pi,0)$ are observed, corresponding to the electron doping of 0.23 per Bi site. We clearly resolve anisotropic band splitting along both ${\it \Gamma}$–$X$ 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.
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Received: 26 September 2016
Published: 29 December 2016
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| PACS: |
74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.70.-b
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(Superconducting materials other than cuprates)
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71.18.+y
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(Fermi surface: calculations and measurements; effective mass, g factor)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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| Fund: Supported by the National Basic Research Program of China under Grant Nos 2015CB921300, 2013CB921700 and 2016YFA0300404, the National Natural Science Foundation of China under Grant Nos 11474340, 11234014, U1532267 and 11674327, and the Chinese Academy of Sciences under Grant No XDB07000000. |
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