二维交替磁体中的脊-自旋-层耦合与新兴脊电子学
Ridge-Spin-Layer Coupling and Emergent Ridgetronics in 2D Altermagnets
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中文总结 AI 辅助
研究在二维交替磁体中引入脊-自旋-层耦合，实现无色散能带的可控自由度，包括层选择性切换脊取向、自旋过滤输运等。基于共线自旋层群对称性确定三种候选材料，将脊电子学建成区分电流方向的可控平台，连接无色散能带与多功能器件操作。
中文摘要 AI 辅助
将谷电子学从动量空间中的离散点扩展到连续线，可将无色散能带转变为可控自由度。本文在二维交替磁体中引入脊-自旋-层耦合（RSLC），动量空间中一维无色散电子态连续线（脊）与自旋极化和原子亚层锁定。这种脊诱导的动能猝灭模拟了平带物理，且RSLC允许外部控制，能实现倒易空间中脊取向的层选择性切换、实空间中的自旋过滤输运及独特的电霍尔响应。基于共线自旋层群对称性，确定了三种二维候选材料。该工作将脊电子学确立为用于区分电流方向的可控平台，架起无色散能带与多功能器件操作的桥梁。
英文摘要
Extending valleytronics from discrete points to continuous lines in momentum space transforms dispersionless bands into a controllable degree of freedom. Here we introduce ridge--spin--layer coupling (RSLC) in two-dimensional (2D) altermagnets, where a one-dimensional continuous line of dispersionless electronic states (a ridge) in momentum space locks to both spin polarization and atomic sublayer. This ridge-induced quenching of kinetic energy mimics flat-band physics, yet crucially, RSLC grants external control, allowing for layer-selective switching of ridge orientation in reciprocal space, spin-filtered transport in real space, and a distinct electric Hall response. Guided by collinear spin layer group symmetry, we identify three 2D candidate materials, namely Mg$_2$Mo$_2$(PO$_5$)$_2$, Ca(FeP)$_2$, and Mg$_2$V$_2$(SO$_5$)$_2$, each featuring a crossed-ridge structure with two ridges, one per spin channel and sublayer. Our work establishes ridgetronics as a controllable platform for direction-discriminating currents, bridging dispersionless bands with multifunctional device operation.
