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The orbital characters of low-energy electronic structure in iron-chalcogenide superconductor KxFe2-ySe2 |
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| Authors: | Fei Chen QingQin Ge Min Xu Yan Zhang XiaoPing Shen Wei Li Masaharu Matsunami Shin-ichi Kimura JiangPing Hu DongLai Feng |
| Institution: | 1. State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University, Shanghai, 200433, China 2. Department of Physics, Fudan University, Shanghai, 200433, China 3. UVSOR Facility, Institute for Molecular Science and The Graduate University for Advanced Studies, Okazaki, 444-8585, Japan 4. Department of Physics, Purdue University, West Lafayette, Indiana, 47907, USA 5. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100080, China |
| Abstract: | The newly discovered iron-chalcogenide superconductorKxFe2ySe2exhibits a distinct electronic structure from other iron-based superconductors.Exploiting polarization-dependent angle-resolved photoemission spectroscopy,we have determined the orbital characters of band structure in aKxFe2ySe2superconductor.To a large extent,we find thatKxFe2ySe2superconductor shares similar orbital characters with other iron-based superconductors,but with its own characteristics.For example,we have resolved two highly degenerate electron cylinders around the zone corner in the s and p geometries,respectively,indicating negligible interactions between them.Moreover,in contrast to the band calculation results,the small electron pocket around Z is found to be mainly consisted of the d z 2 orbital.The determined orbital characters would help to construct a realistic model forKxFe2ySe2. |
| Keywords: | iron-chalcogenide superconductor electronic structure angle-resolved photoemission spectroscopy |
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