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NdO$_{0.5}$F$_{0.5}$BiS$_{2}$ is a new layered superconductor. We havestudied the low-lying electronic structure of a single crystallineNdO$_{0.5}$F$_{0.5}$BiS$_{2}$ superconductor, whose superconducting transitiontemperature is 4.87K, with angle-resolved photoemission spectroscopy. The Fermisurface consists of two small electron pockets around the X point and showslittle warping along the $k_z$ direction. Our results demonstrate themulti-band and two-dimensional nature of the electronic structure. The goodagreement between the photoemission data and the band calculations gives therenormalization factor of 1, indicating the rather weak electron correlationsin this material. Moreover, we found that the actual electron doping level andFermi surface size are much smaller than what are expected from the nominalcomposition, which could be largely explained by the bismuth dificiency. Thesmall Fermi pocket size and the weak electron correlations found here putstrong constraints on theory, and suggest that the BiS$_2$-basedsuperconductors could be conventional BCS superconductors mediated by theelectron-phonon coupling.

Electronic Structure of Single Crystalline NdO$_{0.5}$F$_{0.5}$BiS$_{2}$ Studied by Angle-resolved Photoemission Spectroscopy