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La(O,F)BiSe2 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)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 Γ~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-0.2eV 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.
La (O, F) BiSe2 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) 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 Γ ~ X and MX due to the cooperative effects of large spin-orbit coupling and interlayer coupling.Moreover, we observe an almost non-dispersive electronic state around-0.2eV 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 .