Journal of Siberian Federal University. Mathematics & Physics / Band Structure Modification Due to the Spin-orbit Coupling in the Three-orbital Model for Iron Pnictides

Full text (.pdf)
Issue
Journal of Siberian Federal University. Mathematics & Physics. 2018 11 (4)
Authors
Korshunov, Maxim M.; Togushova, Yuliya N.
Contact information
Korshunov, Maxim M.: Siberian Federal University Svobodny, 79, Krasnoyarsk, 660041 Kirensky Institute of Physics Federal Research Center KSC SB RAS Akademgorodok, Krasnoyarsk, 660036 Russia; ; Togushova, Yuliya N.: Siberian Federal University Svobodny, 79, Krasnoyarsk, 660041 Russia;
Keywords
Fe-based superconductors; spin-orbit coupling; band structure; Fermi surface
Abstract

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 crystallographi- cally 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 ( ; )-pockets along the (0; ) ����� ( ; ) 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.

Pages
430–437
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/71750