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Topological characters in Fe(Te_(1-x)Se_x) thin films

机译：Fe（Te_（1-x）Se_x）薄膜的拓扑特征

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摘要

We investigate topological properties in the Fe(Te,Se) thin films. We find that the single layer FeTe_(1-x)Se_x has nontrivial Z_2 topological invariance which originates from the parity exchange at the Γ 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 x in FeTe_(1-x)Se_x, can drive a topological phase transition. In a bulk material, the two-dimensional Z_2 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 FeTe_(1-x)Se_x as a unique system to integrate high-T_c superconductivity and topological properties in a single electronic structure.
机译：我们研究了Fe（Te，Se）薄膜的拓扑性质。我们发现单层FeTe_（1-x）Se_x具有非平凡的Z_2拓扑不变性，其起源于布里渊区Γ点的奇偶校验交换。非平凡的拓扑结构主要由Te（Se）高度控制。调整阴离子高度（可以实现为FeTe_（1-x）Se_x中晶格常数和x的函数）可以驱动拓扑相变。在块状材料中，二维Z_2拓扑不变性扩展为强三维。在薄膜中，我们预测拓扑不变性随层数的变化而振荡。该结果也可以应用于铁剂。我们的研究建立了FeTe_（1-x）Se_x作为将高T_c超导性和拓扑特性集成在单个电子结构中的独特系统。

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  • 来源
    《Physical review》 |2016年第11期|115129.1-115129.13|共13页
  • 作者

    Xianxin Wu; Shengshan Qin; Yi Liang; Heng Fan; Jiangping Hu;

  • 作者单位

    Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing 100190, China;

    Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing 100190, China,Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA;

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