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We have investigated the electronic structure of BiS$_2$-basedCeO$_{0.5}$F$_{0.5}$BiS$_2$ superconductor using polarization-dependentangle-resolved photoemission spectroscopy (ARPES), and succeeded in elucidatingthe orbital characters on the Fermi surfaces. In the rectangular Fermi pocketsaround X point, the straight portion parallel to the $k_y$ direction isdominated by Bi $6p_x$ character. The orbital polarization indicates theunderlying quasi-one-dimensional electronic structure of the BiS$_2$ system.Moreover, distortions on tetragonally aligned Bi could give rise to the bandJahn-Teller effect.

Fermi surfaces and orbital polarization in superconducting CeO$_{0.5}$F$_{0.5}$BiS$_{2}$ revealed by angle-resolved photoemission spectroscopy