Interplay between electronic correlations and spin-orbit coupling for topological superconductivity of iron chalcogenide
ORAL
Abstract
We investigate the bulk electronic structure and corresponding topological surface Dirac cone of an iron chalcogenide, FeSe0.5Te0.5, in the framework of the combination of linearized quasiparticle self-consistent GW and dynamical mean field theory (LQSGW+DMFT) with spin-orbit coupling. It is shown that the present method predicts the bulk electronic structure and the surface Dirac cone of FeSe0.5Te0.5 in good agreement with angle resolved photoemission experiments. [1,2,3,4] We confirmed that the interplay between electronic correlations and spin-orbit coupling are of great importance for the correct description of non-trivial Z2 and the excitation spectrum of FeSe0.5Te0.5. In particular, the Hund-coupling induced band renormalization is a decisive factor for the surface topological superconductivity in the un-doped system by locating the surface Dirac cone at the chemical potential. [4]
[1] H. Lohani et al., Phys. Rev. B 101, 245146 (2020)
[2] H. Miao et al., Phys. Rev. B 98, 020502 (2018)
[3] P. Johnson et al., Phys. Rev. Lett. 114, 167001 (2015)
[4] P. Zhang et al., Science 360, 182 (2018)
[1] H. Lohani et al., Phys. Rev. B 101, 245146 (2020)
[2] H. Miao et al., Phys. Rev. B 98, 020502 (2018)
[3] P. Johnson et al., Phys. Rev. Lett. 114, 167001 (2015)
[4] P. Zhang et al., Science 360, 182 (2018)
*This work was supported by the U.S Department of Energy, Office of Science, Basic Energy Sciences as a part of the Computational Materials Science Program. Minjae Kim was supported by KIAS Individual Grants (CG083501).
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Presenters
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Minjae Kim
- Korea Institute for Advanced Study