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Evolution of topological superconductivity by orbital-selective confinement in oxide nanowires

机译：氧化物纳米线轨道选择性约束拓扑超导的演变

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摘要

We determine the optimal conditions to achieve topological superconducting phases having spin-singlet pairing for a planar nanowire with a finite lateral width in the presence of an in-plane external magnetic field. We employ a microscopic description that is based on a three-band electronic model including both the atomic spin-orbit coupling and the inversion asymmetric potential at the interface between oxide band-gap insulators. We consider amplitudes of the pairing gap, spin-orbit interactions, and electronic parameters that are directly applicable to nanowires of LaAlO3-SrTiO3. The lateral confinement introduces a splitting of the d orbitals that alters the orbital energy hierarchy and significantly affects the electron filling dependence of the topological phase diagram. Due to the orbital directionality of the t(2g) states, we find that in the regime of strong confinement the onset of topological phases is pinned at electron filling where the quasiflat heavy bands start to get populated. The increase of the nanowire thickness leads to a changeover from a sparse-to-dense distribution of topologically nontrivial domains which occurs at the crossover associated with the orbital population inversion. These findings are corroborated by a detailed analysis of the most favorable topological superconducting phases in the electron doping-magnetic field plane highlighting the role of orbital-selective confinement.
机译：我们确定实现具有有限横向宽度的平面纳米线的旋转态相对的拓扑超导相的最佳条件。我们使用基于三带电子模型的微观描述，包括原子自旋轨道耦合和氧化物带间隙绝缘体之间的界面处的反转不对称电位。我们考虑配对间隙，旋转轨道相互作用和直接适用于Laalo3-Srtio3的纳米线的电子参数的幅度。横向限制引入了D轨道的分裂，其改变了轨道能量等级，并且显着影响了拓扑相图的电子填充依赖性。由于T（2G）的轨道方向性，我们发现，在强大限制的政权中，拓扑阶段的发病在电子填充物中被固定，其中Quasiflat重点开始填充。纳米线厚度的增加导致从拓扑非致态域的稀疏致密分布的转换，这在与轨道群体反转相关的交叉处发生。通过对电子掺杂磁场平面中最有利的拓扑超导阶段的详细分析来证实这些发现，突出了轨道选择性禁闭的作用。

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  • 来源
    《Physical review》 |2019年第9期|094526.1-094526.12|共12页
  • 作者

    Perroni C. A.; Cataudella V; Salluzzo M.; Cuoco M.; Citro R.;

  • 作者单位

    CNR SPIN Complesso Univ Monte S Angelo Via Cintia I-80126 Naples Italy|Univ Napoli Federico II Phys Dept Ettore Pancini Complesso Univ Monte S Angelo Via Cintia I-80126 Naples Italy;

    CNR SPIN Complesso Univ Monte S Angelo Via Cintia I-80126 Naples Italy|Univ Napoli Federico II Phys Dept Ettore Pancini Complesso Univ Monte S Angelo Via Cintia I-80126 Naples Italy;

    CNR SPIN Complesso Univ Monte S Angelo Via Cintia I-80126 Naples Italy;

    CNR SPIN Via Giovanni Paolo 2 132 I-84084 Fisciano Sa Italy|Univ Salerno Phys Dept ER Caianiello Via Giovanni Paolo 2 132 I-84084 Fisciano Sa Italy;

    CNR SPIN Via Giovanni Paolo 2 132 I-84084 Fisciano Sa Italy|Univ Salerno Phys Dept ER Caianiello Via Giovanni Paolo 2 132 I-84084 Fisciano Sa Italy;

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