Ghorashi Sayed Ali Akbar, Hughes Taylor L, Cano Jennifer
Department of Physics and Astronomy, <a href="https://ror.org/05qghxh33">Stony Brook University</a>, Stony Brook, New York 11794, USA.
Department of Physics and Institute for Condensed Matter Theory, <a href="https://ror.org/047426m28">University of Illinois at Urbana-Champaign</a>, Illinois 61801, USA.
Phys Rev Lett. 2024 Sep 6;133(10):106601. doi: 10.1103/PhysRevLett.133.106601.
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.
我们提出了一种异质结构，通过利用交变磁性来实现净磁化为零的一阶和二阶拓扑超导性。与具有均匀磁化的传统平台相比，此类平台可能会有显著改进，因为后者会抑制超导能隙。我们首先介绍一种靠近交变磁体的一维半导体 - 超导体结构，该结构能实现净磁化为零的末端马约拉纳零模（MZMs）。此外，共存的塞曼项提供了一个调节旋钮，用于区分拓扑零模和平凡零模。然后我们提出了二维交变磁体平台，该平台可以实现手性马约拉纳费米子或高阶角马约拉纳零模。我们的这篇文章为利用时间反演破缺的替代源和零净磁化来实现马约拉纳边界态铺平了道路。
