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- W3123989305 abstract "In this paper we provide theoretical LDA+DMFT support of recent ARPES experimental observation of the so called hidden hole like band and corresponding hidden Fermi surface sheet near $Gamma$-point in the K$_{0.62}$Fe$_{1.7}$Se$_2$ compound. To some extent this is a solution to the long-standing riddle of Fermi surface absence around $Gamma$-point in the K$_x$Fe$_{2-y}$Se$_2$ class of iron chalcogenide superconductors. In accordance with the experimental data Fermi surface was found near the $Gamma$-point within LDA+DMFT calculations. Based on the LDA+DMFT analysis in this paper it is shown that the largest of the experimental Fermi surface sheets is actually formed by a hybrid Fe-3d($xy,xz,yz$) quasiparticle band. It is also shown that the Fermi surface is not a simple circle as DFT-LDA predicts, but has (according to the LDA+DMFT) a more complicated `propeller'-like structure due to correlations and multiorbital nature of the K$_x$Fe$_{2-y}$Se$_2$ materials. While the smallest experimental Fermi surface around $Gamma$-point is in some sense fictitious, since it is formed by the summation of the intensities of the spectral function associated with `propeller' loupes and is not connected to any of quasiparticle bands." @default.
- W3123989305 created "2021-02-01" @default.
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- W3123989305 date "2018-10-30" @default.
- W3123989305 modified "2023-10-12" @default.
- W3123989305 title "Hidden Fermi Surface in KxFe2–ySe2: LDA + DMFT Study" @default.
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- W3123989305 doi "https://doi.org/10.1134/s0021364018210038" @default.
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