Topological insulators with perfect vacancy superstructure and possible implications for iron chalcogenide superconductors

Details Topological insulators with perfect vacancy superstructure and possible implications for iron chalcogenide superconductors Topological insulators with perfect vacancy superstructure and possible implications for iron chalcogenide superconductors

2011-03-13

arxiv.org/abs/1103.2538v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

Motivated by the newly-discovered intercalated iron chalcogenide superconductors, we construct a single orbital tight-binding model for topological insulators on the square lattice with a perfect vacancy superstructure. We find that such lattice structure naturally accommodates a non-vanishing geometry phase associated with the next-nearest-neighbor spin-orbit interaction. By calculating the bulk band structures and the finite stripe edge states, we show that the topological insulator phases can be tuned at certain electron fillings in a wide range of the model parameters. The possible implications of these results for the iron deficient compounds $(A,Tl)_{y}Fe_{2-x}Se_2$ have been discussed.

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