标题： 具有扭曲的马约拉纳：在反铁磁异质结构中的可调马约拉纳零能模 显示英文标题

标题： Majoranas with a twist: Tunable Majorana zero modes in altermagnetic heterostructures

摘要： 反铁磁性为实现净磁化为零的马约拉纳零模提供了新途径。我们考虑一种最近提出的异质结构，该结构由位于反铁磁体上的半导体纳米线以及通过邻近效应诱导的超导性组成。我们证明旋转纳米线可以作为调节旋钮来诱导拓扑相。对于$d$、$g$和$i$波反铁磁配对，我们推导了角度依赖的拓扑能隙闭合条件。我们推导了在这些角度上诱导的反铁磁性必须消失的对称性约束，并通过显式模型进行了验证。我们的结果表明，弯曲或弯曲的纳米线实现了空间依赖的拓扑不变量，马约拉纳零模被固定在拓扑不变量变化的位置。这提供了一种新的实验设置，使得单根纳米线可以在不需要$in$ $situ$ 调整的情况下同时容纳拓扑平凡和非平凡区域。 显示英文摘要

摘要： Altermagnetism provides new routes to realize Majorana zero modes with vanishing net magnetization. We consider a recently proposed heterostructure consisting of a semiconducting wire on top of an altermagnet and with proximity-induced superconductivity. We demonstrate that rotating the wire serves as a tuning knob to induce the topological phase. For $d$-, $g$- and $i$-wave altermagnetic pairing, we derive angle-dependent topological gap-closing conditions. We derive symmetry constraints on angles where the induced altermagnetism must vanish, which we verify by explicit models. Our results imply that a bent or curved wire realizes a spatially-dependent topological invariant with Majorana zero modes pinned to positions where the topological invariant changes. This provides a new experimental set-up whereby a single wire can host both topologically trivial and nontrivial regimes without $in$ $situ$ tuning.