Geodesic
Band structure modification due to the spin-orbit coupling in the three-orbital model for iron pnictides
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 11 (2018) no. 4, pp. 430-437

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We study the effect of the spin-orbit coupling on the band structure and the Fermi surface of the three-orbital model within the two-iron Brillouin zone. Due to the presence of two irons in the crystallographically correct unit cell, the spin-orbit coupling can be divided into the intra- and intercell parts with respect to the one-iron unit cell. We show that the intercell part produces the reconstruction of the Fermi surface in the form of the pronounced splitting between the previously degenerate electron $(\pi,\pi)$-pockets along the $(0,\pi)-(\pi,\pi)$ direction. Intracell part shifts the bands around $(0,0)$ point and removes degeneracy there. There are also some other band shifts but they should not affect the low-energy physics because they occur at energy scales of about $1$ eV below the Fermi level.
Keywords: Fe-based superconductors, spin-orbit coupling, band structure
Mots-clés : Fermi surface. 
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     author = {Maxim M. Korshunov and Yuliya N. Togushova},
     title = {Band structure modification due to the spin-orbit coupling in the three-orbital model for iron pnictides},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {430--437},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2018_11_4_a3/}
}
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Maxim M. Korshunov; Yuliya N. Togushova. Band structure modification due to the spin-orbit coupling in the three-orbital model for iron pnictides. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 11 (2018) no. 4, pp. 430-437. http://geodesic.mathdoc.fr/item/JSFU_2018_11_4_a3/