将结构光量子编码为面内拓扑自旋纹理
Quantum encoding of structured light into in-plane topological spin textures
AI总结：
该研究通过微磁模拟，利用不同轨道角动量的拉盖尔-高斯光学涡旋，在手性铁磁薄膜中实现了面内拓扑自旋纹理的选择性成核，为拓扑磁态的写入提供了新途径。
AI中文摘要：
结构光通过多个可调光学自由度为控制光-物质相互作用提供了有效手段。我们采用微磁模拟，分别研究了具有$C_{nv}$和$D_{2d}$对称性的手性铁磁薄膜中，脉冲拉盖尔-高斯光学涡旋诱导非对称双磁子（bimeron）和反双磁子（antibimeron）的成核过程。对于轨道角动量（OAM）$|m|=1$的光学涡旋，圆偏振光束可通过自旋角动量、OAM与手性的相互作用确定性地成核单个双磁子或反双磁子，而线偏振光束产生的纹理其拓扑电荷直接遵循OAM（$Q=m$）。OAM$|m|>1$的光学涡旋会成核由多个自旋纹理组成的团簇及其他构型，其形态和拓扑电荷对光学量子数和脉冲参数敏感依赖。这些发现揭示了一种通过将光学量子数编码为不同面内拓扑磁态实现拓扑选择性写入的途径。
英文摘要：
Structured light offers a powerful means of controlling light-matter interactions through multiple tunable optical degrees of freedom. Using micromagnetic simulations, we investigate the nucleation of asymmetric bimerons and antibimerons by pulsed Laguerre-Gaussian optical vortices in chiral ferromagnetic thin films with $C_{nv}$ and $D_{2d}$ symmetries, respectively. For optical vortices with orbital angular momentum (OAM) $|m|=1$, circularly polarized beams deterministically nucleate a single bimeron or antibimeron via the interplay of spin angular momentum, OAM, and magnetic chirality, whereas linearly polarized beams produce textures whose topological charge directly follows the OAM ($Q=m$). Optical vortices with OAM $|m|>1$ nucleate clusters and other configurations composed of multiple spin textures, whose morphology and topological charge depend sensitively on the optical quantum numbers and pulse parameters. These findings reveal a route to topology-selective writing through the encoding of optical quantum numbers into distinct in-plane topological magnetic states.
