论文标题
内在平面厅效应的轨道起源
Orbital Origin of Intrinsic Planar Hall Effect
论文作者
论文摘要
最近的实验报道了反对称平面厅的效应，其中霍尔电流在平面磁场中是奇数，并用施加电场和磁场线性地缩放。现有理论仅依赖于旋转起源，这需要旋转轨道耦合才能生效。在这里，我们开发了一种固有平面霍尔效应（IPHE）的一般理论，突出了以前未知的轨道机制，并将其连接到带状几何数量 - 异常轨道极化性（AOP）。重要的是，轨道机制不需要自旋轨道耦合，因此可以发生相当大的IPHE，并由轨道轨道弱耦合的系统中的轨道贡献主导。结合第一原则计算，我们通过对散装材料的定量评估$ \ mathrm {tasb_ {2}} $，$ \ mathrm {nbas_ {2}} $和$ \ mathrm {sras_ {3}} $。我们进一步表明，AOP及其相关的轨道IPHE可以在拓扑带交叉处大大增强，从而提供了一种探测拓扑材料的新方法。
Recent experiments reported an antisymmetric planar Hall effect, where the Hall current is odd in the in-plane magnetic field and scales linearly with both electric and magnetic fields applied. Existing theories rely exclusively on a spin origin, which requires spin-orbit coupling to take effect. Here, we develop a general theory for the intrinsic planar Hall effect (IPHE), highlighting a previously unknown orbital mechanism and connecting it to a band geometric quantity -- the anomalous orbital polarizability (AOP). Importantly, the orbital mechanism does not request spin-orbit coupling, so sizable IPHE can occur and is dominated by orbital contribution in systems with weak spin-orbit coupling. Combined with first-principles calculations, we demonstrate our theory with quantitative evaluation for bulk materials $\mathrm{TaSb_{2}}$, $\mathrm{NbAs_{2}}$, and $\mathrm{SrAs_{3}}$. We further show that AOP and its associated orbital IPHE can be greatly enhanced at topological band crossings, offering a new way to probe topological materials.
