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High-temperature Majorana fermions in magnet-superconductor hybrid systems

机译：磁体超导体混合系统中的高温Majorana码头

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摘要

Magnet-superconductor hybrid (MSH) structures represent one of the most promising platforms to realize, control, and manipulate Majorana modes using scanning tunneling methods. By depositing either chains or islands of magnetic atoms on the surface of a conventional, elemental superconductor such as Pb or Re, topological superconducting phases can emerge. They feature either localized Majorana bound states at the chain ends or dispersing chiral Majorana modes at the island's boundary. Yet some of these experiments have not reached the spectral resolution to clearly distinguish between topological Majorana and trivial Shiba states due to very small superconducting gap sizes and experiments performed at sub-Kelvin temperatures. Here we consider superconducting substrates with unconventional spin-singlet pairing, including high-temperature d-wave and extended s-wave superconductors. We derive topological phase diagrams and compute edge states for cylinder and island geometries and discuss their properties. Several time-reversal invariant topological superconducting phases of the Zhang-Kane-Mele type are found and discussed. Moreover, we study one-dimensional MSH structures and show that parameters to realize topologically nontrivial magnetic chains embedded into a larger, two-dimensional substrate differ from the purely one-dimensional case. Quite generally we find that unconventional superconducting substrates work as well as the conventional s-wave substrates to realize topological phases. In particular, iron-based pnictide and chalcogenide superconductors are the most promising class of substrates for future high-temperature MSH systems.
机译：磁体超导体混合（MSH）结构代表使用扫描隧道方法实现最有希望的平台，控制和操纵Majorana模式。通过在常规的元素超导体的表面上沉积磁性原子的链或岛，例如Pb或Re，拓扑超导相可以出现。它们在链条的局部吉姆纳纳界州的局部界定，或在岛的边界处分散手性主题模式。然而，这些实验中的一些尚未达到光谱分辨率，以显然区分拓扑Majorana和Trivial Shiba状态，由于在亚开尔文温度下进行的超导间隙尺寸和实验。在这里，我们考虑具有非常规旋转态配对的超导基板，包括高温D波和延伸的S波超导体。我们派生拓扑相图和圆柱形几何形状的计算边缘状态，并讨论其性质。发现并讨论了张凯恩 - 熔酶的几个时间逆转不变拓扑超导阶段。此外，我们研究了一维MSH结构，并表明将拓扑非学生磁链嵌入到更大的二维基板中的拓扑非磁力链与纯一维壳体不同。通常，我们发现非常规超导基板的工作以及传统的S波基板以实现拓扑相。特别地，铁基毒性和硫属化物超导体是未来高温MSH系统中最有前途的基板等级。

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  • 来源
    《Physical review》 |2020年第17期|174510.1-174510.15|共15页
  • 作者

    Daniel Crawford; Eric Mascot; Dirk K. Morr; Stephan Rachel;

  • 作者单位

    School of Physics University of Melbourne Parkville VIC 3010 Australia;

    University of Illinois at Chicago Chicago Illinois 60607 USA;

    University of Illinois at Chicago Chicago Illinois 60607 USA;

    School of Physics University of Melbourne Parkville VIC 3010 Australia;

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