发表机构
Rensselaer Polytechnic Institute（伦斯勒理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过结构化Laguerre-Gaussian光场调控NaSn$_2$As$_2$的goniopolar热电性，发现OAM依赖的标度律和倍频响应，并增强热电窗口，为外部控制提供新途径。
AI 中文摘要
Goniopolar金属沿不同晶向表现出相反的热电极性，从而能够实现零磁场横向热电效应，但提供的外部控制手段很少。这里我们展示，一个空间结构化的Laguerre-Gaussian矢量势可以可编程地重构NaSn$_2$As$_2$的goniopolar相空间。基于第一性原理导出的Wannier输运，结合依赖键的Peierls耦合，揭示了两个依赖轨道角动量（OAM）的空间标度律：径向响应遵循Laguerre-Gaussian半径$r_{\max}\propto\sqrt{|\ell|}$，而对$|\ell|=2$–5的计算得到主导角谐波$m_{\mathrm{dom}}=2|\ell|$，将光学缠绕编码为倍频热电响应。增大$|\ell|$同时重构了预先存在的goniopolar窗口，在$|\ell|=5$时使一个代表性窗口增强约17%。相反，在固定偏振下反转$\ell$仅产生小修正，该修正近似在偏振反转时互换。能量分辨输运显示，结构化场重新分配了面内和面外电子速度，移动了定义goniopolar态的方向性Seebeck零点边界。这些结果确立了涡旋位置和OAM幅度作为goniopolar热电性的可编程控制坐标。
英文摘要
Goniopolar metals exhibit opposite thermoelectric polarities along different crystallographic directions, enabling zero-field transverse thermoelectricity but offering few means for external control. Here we show that a spatially structured Laguerre--Gaussian vector potential can programmably reconstruct the goniopolar phase space of NaSn$_2$As$_2$. First-principles-derived Wannier transport with bond-dependent Peierls coupling reveals two OAM-dependent spatial scaling laws: the radial response follows the Laguerre--Gaussian radius $r_{\max}\propto\sqrt{|\ell|}$, while calculations for $|\ell|=2$--5 yield a dominant angular harmonic $m_{\mathrm{dom}}=2|\ell|$, encoding the optical winding in a frequency-doubled thermoelectric response. Increasing $|\ell|$ simultaneously reconstructs pre-existing goniopolar windows, enhancing a representative window by approximately 17\% at $|\ell|=5$. By contrast, reversing $\ell$ at fixed polarization produces only a small correction that approximately interchanges upon polarization reversal. Energy-resolved transport reveals that the structured field redistributes in-plane and cross-plane electronic velocities, shifting the directional Seebeck-zero boundaries that define the goniopolar state. These results establish vortex position and OAM magnitude as programmable control coordinates for goniopolar thermoelectricity.
Comments6 pages, 4 figures
