通过交替磁体介导的铰链模式在高阶拓扑相中实现的当前开关行为
Current switching behavior mediated via hinge modes in higher-order topological phases using altermagnets
AI总结：
本文提出通过耦合d波交替磁体设计混合阶和高阶拓扑相，研究铰链模式的拓扑特性及可控电流开关行为。
摘要：
我们提出一个理论框架，通过将d波交替磁体（AMs）耦合到三维拓扑绝缘体中，来工程混合阶和高阶拓扑相。仅存在d_{x²−y²}型AM将系统驱动到混合阶拓扑相，其中一阶和二阶拓扑相共存。该相通过谱分析、低能表面理论、偶极子和四极子 winding 数以及两终端差分电导计算进一步确认。引入d_{x²−z²}型AM将系统驱动到两种不同的二阶拓扑绝缘体相，这些相通过谱分析、拓扑不变量、低能表面理论和传输计算进行拓扑表征。重要的是，通过调节交替磁交换序的相对强度可以控制这些一维铰链模式的局域化和传播方向。我们利用这一特性提出了一种通过铰链模式介导的可调电流开关行为。我们的结果表明，基于AMs的混合结构是可控高阶拓扑和铰链介导设备应用的多功能平台。
英文摘要：
We propose a theoretical framework to engineer hybrid-order and higher-order topological phases in three-dimensional topological insulators by coupling to $d$-wave altermagnets (AMs). Presence of only $d_{x^2-y^2}$-type AM drives the system into a hybrid-order topological phase where both first-order and second-order topological phases coexist. This phase is characterized by spectral analysis, low-energy surface theory, dipolar and quadrupolar winding numbers, and it's signature is further confirmed by two-terminal differential conductance calculations. Incorporation of the $d_{x^2-z^2}$-type AM drives the system into two second-order topological insulator phases hosting distinct type of hinge modes. These two variants of second-order topological phases are also topologically characterized by spectral analysis, topological invariants, low-energy surface thoery, and transport calculations. Importantly, the localization and direction of propagation of these one-dimensional hinge modes are controllable by tuning the relative strengths of the alermagnetic exchange orders. We utilize this feature to propose a tunable current-switching behaviour mediated via the hinge modes. Our results establish AMs based hybrid structure as a versatile platform for controllable higher-order topology and hinge-mediated device applications.
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