| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electronic Structure Properties in the Nematic Phases of FeSe |
| LIANG Yi1, WU Xian-Xin1, HU Jiang-Ping1,2,3** |
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
5Collaborative Innovation Center of Quantum Matter, Beijing 100875
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| Cite this article: |
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LIANG Yi, WU Xian-Xin, HU Jiang-Ping 2015 Chin. Phys. Lett. 32 117402 |
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Abstract We investigate the electronic structures of FeSe in the presence of different possible orders and spin-orbit coupling (SOC). It is found that only the ferro-orbital order (FO) and the collinear antiferro-magnetism (C-AFM) can simultaneously induce splittings at Γ and M. Bicollinear antiferro-magnetism (B-AFM) and SOC have very similar band structures on Γ–M near the Fermi level. The temperature T insensitive splitting at Γ and the T-dependent splitting at M observed in recent experiments can be explained by the d-wave bond nematic (dBN) order together with SOC. The recent observed Dirac cones and their T-dependence in FeSe thin films can also be well explained by the dBN order together with the band renormalization. Their thickness- and cobalt-doping-dependent behaviors are the consequences of electron doping and reduction of Se height. All these suggest that the nematic order in the FeSe system is the dBN order.
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Received: 15 October 2015
Published: 01 December 2015
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| PACS: |
74.20.Pq
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(Electronic structure calculations)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.70.Xa
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(Pnictides and chalcogenides)
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