For authors
Submission status

Archive (English)
      Volume 116
      Volume 115
      Volume 114
      Volume 113
      Volume 112
      Volume 111
      Volume 110
      Volume 109
      Volume 108
      Volume 107
      Volume 106
      Volume 105
      Volume 104
      Volume 103
      Volume 102
      Volume 101
      Volume 100
      Volume 99
      Volume 98
      Volume 97
      Volume 96
      Volume 95
      Volume 94
      Volume 93
VOLUME 108 | ISSUE 9 | PAGE 657
Hidden Fermi surface in KxFe2-ySe2: LDA + DMFT study
In this paper we provide theoretical LDA + DMFT support of recent angle-resolved photoemission spectroscopy (ARPES) observation of the so-called hidden hole-like band and corresponding hidden Fermi surface sheet near Γ-point in the K0.62Fe1.7Se2 compound. To some extent this is a solution to the long-standing riddle of Fermi surface absence around Γ-point in the KxFe2-ySe2 class of iron chalcogenide superconductors. In accordance with the experimental data Fermi surface was found near the Γ-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 KxFe2- ySe2 materials. While the smallest experimental Fermi surface around Γ-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.