Altermagnetic Routes to Majorana Modes in Zero Net Magnetization,Physical Review Letters

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Altermagnetic Routes to Majorana Modes in Zero Net Magnetization
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-05 , DOI: 10.1103/physrevlett.133.106601
Sayed Ali Akbar Ghorashi ₁ , Taylor L. Hughes ₂ , Jennifer Cano _{1,

3}

Affiliation

We propose heterostructures that realize first and second order topological superconductivity with vanishing net magnetization by utilizing altermagnetism. Such platforms may offer a significant improvement over conventional platforms with uniform magnetization since the latter suppresses the superconducting gap. We first introduce a 1D semiconductor-superconductor structure in proximity to an altermagnet that realizes end Majorana zero modes (MZMs) with vanishing net magnetization. Additionally, a coexisting Zeeman term provides a tuning knob to distinguish topological and trivial zero modes. We then propose 2D altermagnetic platforms that can realize chiral Majorana fermions or higher order corner MZMs. Our Letter paves the way toward realizing Majorana boundary states with an alternative source of time-reversal breaking and zero net magnetization.

中文翻译：

零净磁化下马约拉纳模式的交变磁路线

我们提出了利用交变磁力实现净磁化强度消失的一阶和二阶拓扑超导的异质结构。与具有均匀磁化的传统平台相比，此类平台可以提供显着的改进，因为后者抑制了超导间隙。我们首先在交流磁体附近引入一维半导体超导体结构，该结构实现了净磁化强度消失的端部马约拉纳零模式（MZM）。此外，共存的塞曼项提供了一个调谐旋钮来区分拓扑和平凡的零模式。然后，我们提出了可以实现手性马约拉纳费米子或高阶角 MZM 的 2D 交变磁平台。我们的信为通过时间反转破坏和零净磁化的替代源实现马约拉纳边界态铺平了道路。

更新日期：2024-09-05

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