Fermi surfaces and orbital polarization in superconducting CeO${}_{0.5}$F${}_{0.5}$BiS${}_2$ revealed by angle-resolved photoemission spectroscopy

Abstract

We have investigated the electronic structure of BiS${}_2$-based CeO${}_{0.5}$F${}_{0.5}$BiS${}_2$ 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 X point, the straight portion parallel to the $k_y$ direction is dominated by Bi $6p_x$ character. The orbital polarization indicates the underlying quasi-one-dimensional electronic structure of the BiS${}_2$ system. Moreover, distortions on tetragonally aligned Bi could give rise to the band Jahn-Teller effect.

arXiv comment5 pages, 4 figures

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• Anisotropic two-gap superconductivity and the absence of a Pauli paramagnetic limit in single-crystalline LaO${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Localized and mixed valence state of Ce $4f$ in superconducting and ferromagnetic CeO${}_{1-x}$F${}_x$BiS${}_2$ revealed by x-ray absorption and photoemission spectroscopy
• Strong bilayer coupling induced by the symmetry breaking in the monoclinic phase of BiS${}_2$-based superconductors
• Electronic and magnetic properties of superconducting LnO${}_{1-x}$F${}_x$BiS${}_2$ (Ln = La, Ce, Pr, and Nd) from first principles
• Hidden charge density wave induced shadow bands and ultrafast dynamics of CuTe investigated using time-resolved ARPES
• Multiband superconductivity in $\mathrm{Bi}{\mathrm{S}}_2$-based layered compounds
• Applying experimental constraints to a one-dimensional model for BiS2 superconductivity
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• Electronic band structure of (111) $SrRu{O}_3$ thin film$-$an angle-resolved photoemission spectroscopy study
• Chemical Substitution and High Pressure Effects on Superconductors in the $Ln$OBiS${}_2$ ($Ln$ = La-Nd) System