Fermi surfaces and orbital polarization in superconducting CeO0.5 F0.5BiS2 revealed by angle-resolved photoemission spectroscopy

T Sugimoto, D Ootsuki, C Morice, Emilio Artacho, Siddharth Saxena, EF Schwier, M Zheng, Y Kojima, H Iwasawa, K Shimada, M Arita, H Namatame, M Taniguchi, M Takahashi, NL Saini, T Asano, R Higashinaka, TD Matsuda, Y Aoki & T Mizokawa
We have investigated the electronic structure of BiS2-based CeO0.5F0.5BiS2 superconductor using polarization-dependent angle-resolved photoemission spectroscopy (ARPES), and succeeded in elucidating the orbital characters on the Fermi surfaces. In the rectangular Fermi pockets around the X point, the straight portion parallel to the ky direction is dominated by Bi 6px character. The orbital polarization indicates the underlying quasi-one-dimensional electronic structure of the BiS2 system. Moreover, distortions on tetragonally aligned Bi could give rise to the band...
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