Abstract
We investigate topological properties in the Fe(Te,Se) thin films. We find that the single layer has nontrivial topological invariance which originates from the parity exchange at the point of the Brillouin zone. The nontrivial topology is mainly controlled by the Te(Se) height. Adjusting the anion height, which can be realized as the function of lattice constants and in , can drive a topological phase transition. In a bulk material, the two-dimensional topology invariance is extended to a strong three-dimensional one. In a thin film, we predict that the topological invariance oscillates with the number of layers. The results can also be applied to iron pnictides. Our research establishes as a unique system to integrate high- superconductivity and topological properties in a single electronic structure.
3 More- Received 8 July 2015
- Revised 15 December 2015
DOI:https://doi.org/10.1103/PhysRevB.93.115129
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