Unusual band renormalization in the simplest iron based superconductor

Authors :: Maletz, J.
Zabolotnyy, V. B.
Evtushinsky, D. V.
Thirupathaiah, S.
Wolter, A. U. B.
Harnagea, L.
Yaresko, A. N.
Vasiliev, A. N.
Chareev, D. A.
Rienks, E. D. L.
Büchner, B.
Borisenko, S. V.
Source :: Phys. Rev. B 89, 220506(R) (2014)
Publication Year :: 2013
Abstract: The electronic structure of the iron chalcogenide superconductor FeSe_{1-x} was investigated by high- resolution angle-resolved photoemission spectroscopy (ARPES). The results were compared to DFT calculations showing some significant differences between the experimental electronic structure of FeSe_{1-x}, DFT calculations and existing data on FeSe_{x}Te_{1-x}. The bands undergo a pronounced orbital dependent renormalization, different from what was observed for FeSe_{x}Te_{1-x} and any other pnictides.