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. 2016 Jul 28;7:12297. doi: 10.1038/ncomms12297

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Copyright © 2016, The Author(s)

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Electronic structure obtained from density-functional-theory (DFT) calculations. (a) The atomic configuration: Fe adatoms form a buckled a honeycomb lattice on the Pb (111) surface. (b) Fermi surface of the Fe d-orbitals at energy E_F=0.09 eV, where the Wigner–Seitz cell (dashed line) and the primitive vectors (arrowed lines) for the reciprocal lattice are indicated. A single Fermi surface is found around the Γ point in this case. (c) DFT band structure of the Fe d-orbitals with spin-orbit coupling. (d) Chern number of the Bogoliubov-de Gennes bands, as a function of Fermi energy, when s-wave superconductivity (Δ=0.01 eV in this calculation) is introduced in the system. The green dashed lines in both (c) and (d) mark the same energy corresponding to the Fermi surface given in (b).