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arXiv 1610.06930cond-mat.str-elcond-mat.mes-hallcond-mat.mtrl-scicond-mat.supr-con
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掺杂Weyl环材料的拓扑表面超导电性

Topological surface superconductivity in doped Weyl loop materials

Yuxuan Wang, Rahul M. Nandkishore

摘要:

我们研究表面超导性涉及的“鼓面”表面状态(掺杂)外尔环材料。在体中的主导弱耦合不稳定性是朝向手征超导秩序,完全间隙的费米面。在这种状态下,表面也变得超导,具有$p+ip$对称性。我们表明,表面SC状态是“拓扑”,只要它是完全有间隙的,和系统陷阱Majoarana模式无论涡线进入或退出的散装。与真正的二维$p+ip$超导体相反,这些马约拉纳零模式甚至在化学势完全高于/低于鼓膜的“强配对”状态下也会出现。我们还考虑了传统的$s$波配对,并表明,在这种情况下,表面主机的电荷中性马约拉纳费米子,其动量范围是由散装费米表面的投影的平带。因此,外尔环材料提供了新形式的拓扑超导性。

英文摘要:

We study surface superconductivity involving the `drumhead' surface states of (doped) Weyl loop materials. The leading weak coupling instability in the bulk is toward a chiral superconducting order, which fully gaps the Fermi surface. In this state the surface also becomes superconducting, with $p+ip$ symmetry. We show that the surface SC state is "topological" as long as it is fully gapped, and the system traps Majoarana modes wherever a vortex line enters or exits the bulk. In contrast to true 2D $p+ip$ superconductors, these Majorana zero modes arise even in the "strong pairing" regime where the chemical potential is entirely above/below the drumhead. We also consider conventional $s$-wave pairing, and show that in this case the surface hosts a flat band of charge neutral Majorana fermions, whose momentum range is given by the projection of the bulk Fermi surface. Weyl loop materials thus provide access to new forms of topological superconductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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