Geodesic
Changes of the Fermi surface topology in the three-orbital model for iron pnictides with the spin-orbit coupling
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 16 (2023) no. 6, pp. 795-803

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Effect of the spin-orbit coupling on the band structure and the Fermi surface of the three-orbital model is studied. The inter-orbital part of the model is reformulated to fully conform with the iron lattice symmetry. Because there are two iron ions in the unit cell, we introduce the intra- and inter-ion spin-orbit coupling constants to separate the effect of the related couplings on the band structure and the Fermi surface. Both the intra- and inter-ion parts lift the degeneracy of some bands at the $\Gamma=(0,0)$ point and the splitting of bands along the $(0,\pi)-(\pi,\pi)$ direction of the Brillouin zone. We show that the inter-ion part of the spin-orbit coupling leads to the topological change of the Fermi surface — the splitting of two Fermi surface sheets around the $M=(\pi,\pi)$ point.
Keywords: Fe-based superconductors, spin-orbit coupling, band structure
Mots-clés : Fermi surface. 
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     author = {Danil A. Ivanov and Yuliya N. Togushova and Maxim M. Korshunov},
     title = {Changes of the {Fermi} surface topology in the three-orbital model for iron pnictides with the spin-orbit coupling},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
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     publisher = {mathdoc},
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     number = {6},
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     url = {http://geodesic.mathdoc.fr/item/JSFU_2023_16_6_a9/}
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Danil A. Ivanov; Yuliya N. Togushova; Maxim M. Korshunov. Changes of the Fermi surface topology in the three-orbital model for iron pnictides with the spin-orbit coupling. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 16 (2023) no. 6, pp. 795-803. http://geodesic.mathdoc.fr/item/JSFU_2023_16_6_a9/