Experimental Investigation of Electronic Structure of La(O,F)BiSe_2

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.