对斯格明子晶体的超快相干控制进行成像
Imaging the ultrafast coherent control of a skyrmion crystal
AI总结：
本研究针对斯格明子的确定性动力学操控难题，提出利用圆偏振飞秒激光脉冲通过逆法拉第效应激发集体磁振子模式，实现斯格明子晶体的超快相干旋转控制，为高速自旋逻辑器件研发提供了新途径。
摘要：
由热力学涨落与拓扑涨落之间的微妙相互作用产生的新奇磁织构，因其在自旋电子器件中的潜在应用而引发了浓厚的研究兴趣。电子显微镜领域的最新进展已实现对随机光生单个斯格明子的成像。然而，此类涨落的混沌特性以及磁能 landscape 中不同极小值之间本质上不可逆的切换，阻碍了对它们的确定性和动力学操控。在此，我们展示了一种方法，能够以远快于此前观测到的速度，离散量地相干控制斯格明子晶体的旋转。通过使用能量低于 Mott 绝缘体 Cu₂OSeO₃ 带隙的圆偏振飞秒激光脉冲，我们通过逆法拉第效应激发了集体磁振子模式。这会触发相干磁振荡，直接控制经冷冻洛伦兹透射电子显微镜（cryo-Lorentz Transmission Electron Microscopy）成像的斯格明子晶体的旋转。本文展示的通过超快激光脉冲操控拓扑序的方法，可用于构建高速基于自旋的逻辑器件。
英文摘要：
Exotic magnetic textures emerging from the subtle interplay between thermodynamic and topological fluctuation have attracted intense interest due to their potential applications in spintronic devices. Recent advances in electron microscopy have enabled the imaging of random photo-generated individual skyrmions. However, their deterministic and dynamical manipulation is hampered by the chaotic nature of such fluctuations and the intrinsically irreversible switching between different minima in the magnetic energy landscape. Here, we demonstrate a method to coherently control the rotation of a skyrmion crystal by discrete amounts at speeds which are much faster than previously observed. By employing circularly polarized femtosecond laser pulses with an energy below the bandgap of the Mott insulator Cu2OSeO3, we excite a collective magnon mode via the inverse Faraday effect. This triggers coherent magnetic oscillations that directly control the rotation of a skyrmion crystal imaged by cryo-Lorentz Transmission Electron Microscopy. The manipulation of topological order via ultrafast laser pulses shown here can be used to engineer fast spin-based logical devices.
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