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Induced half-metallicity and gapless chiral topological superconductivity in the CrI_3-Pb interface

机译:CRI_3-PB界面中的半金属性和无间隙手性拓扑超导性

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摘要

We study a two-dimensional heterostructure comprised of a monolayer of the magnetic insulator chromium triiodide (CrI_3) on a superconducting lead (Pb) substrate. Through first-principles computation and a tight-binding model, we demonstrate that charge transfer from the Pb substrate dopes the CrI_3 into an effective half-metal, allowing for the onset of a gapless topological superconductivity phase via the proximity effect. This phase, in which there exists a superconducting gap only in part of the Fermi surface, is shown to occur generically in two-dimensional (2D) half-metal-superconductor heterostructures which lack twofold in-plane rotational symmetry. However, a sufficiently large proximity-induced pairing amplitude can bring such a system into a fully gapped topological superconducting (TSC) phase. As such, these results are expected to better define the optimal 2D component materials for future proposed TSC heterostructures.
机译:我们研究了由超导引线(Pb)衬底上的磁绝缘体铬三碘化物(CRI_3)的单层组成的二维异质结构。通过第一原理计算和紧密结合模型,我们证明从PB衬底的电荷转移将CRI_3掺杂到有效的半金属中,允许通过接近效果开始无级拓扑超导相开始。该阶段,其中仅在部分FERMI表面存在超导间隙,示出了在二维(2D)半金属 - 超导体异质结构中的一般上发生,其缺乏双面旋转对称性。然而,足够大的接近感应配对幅度可以将这样的系统带入完全覆盖的拓扑超导(TSC)相位中。因此,预计这些结果将更好地定义最佳的2D组件材料,以备将来提出的TSC异质结构。

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  • 来源
    《Physical review》 |2020年第2期|024515.1-024515.9|共9页
  • 作者单位

    Department of Condensed Matter Weizmann Institute of Science Rehovot Isreal;

    Department of Condensed Matter Weizmann Institute of Science Rehovot Isreal;

    Department of Condensed Matter Weizmann Institute of Science Rehovot Isreal;

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