点反射
凝聚态物理
轨道磁化
拉希巴效应
非键轨道
磁性
物理
自旋轨道相互作用
几何相位
轨道重叠
轨道(动力学)
自旋电子学
电子
原子轨道
量子力学
铁磁性
磁场
磁各向异性
磁化
航空航天工程
工程类
作者
Dongwook Go,Jan-Philipp Hanke,Patrick M. Buhl,Frank Freimuth,Gustav Bihlmayer,Hyun‐Woo Lee,Yuriy Mokrousov,Stefan Blügel
摘要
When the inversion symmetry is broken at a surface, spin-orbit interaction gives rise to spin-dependent energy shifts - a phenomenon which is known as the spin Rashba effect. Recently, it has been recognized that an orbital counterpart of the spin Rashba effect - the orbital Rashba effect - can be realized at surfaces even without spin- orbit coupling. Here, we propose a mechanism for the orbital Rashba effect based on sp orbital hybridization, which ultimately leads to the electric polarization of surface states. As a proof of principle, we show from first principles that this effect leads to chiral orbital textures in $\mathbf{k}$-space of the BiAg$_2$ monolayer. In predicting the magnitude of the orbital moment arising from the orbital Rashba effect, we demonstrate the crucial role that the Berry phase theory plays for the magnitude and variation of the orbital textures. As a result, we predict a pronounced manifestation of various orbital effects at surfaces, and proclaim the orbital Rashba effect to be a key platform for surface orbitronics.
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