论文标题
超快的抗磁性梅隆 - 安蒂姆赛对与拓扑电荷的保护
Ultrafast optical generation of antiferromagnetic meron-antimeron pairs with conservation of topological charge
论文作者
论文摘要
我们提出了一种新的机制，可以通过热雪松机构在二维抗铁磁铁中产生梅隆 - 抗抗素对，并具有超快激光脉冲。与超快速的天际成核不同，此过程可以保存总拓扑电荷。我们系统地显示动力学的不同阶段，并定义适当的拓扑不变性以表征配置。紧急结构可以将其拓扑结构保留为100 ps。通过引入拓扑结构因子，我们表明，对随机选择的初始磁性构型的任何随机选择都是可靠的，并且可以抵抗疾病。我们的发现表明，可以通过光学地达到超越传统的天空的丰富旋转纹理世界。
We propose a new mechanism to produce a meron-antimeron pair in a two dimensional antiferromagnet with an ultrafast laser pulse via thermal Schwinger mechanism. Unlike ultrafast skyrmion nucleation, this process conserves total topological charge. We systematically show different stages of the dynamics and define proper topological invariants to characterise the configurations. The emergent structure can retain its topological structure for up to 100 ps. By introducing a topological structure factor we show that pair formation is robust against any random choice of initial magnetic configuration and can survive against disorder. Our findings demonstrate that the rich world of spin textures, which goes beyond conventional skyrmions, can be reached optically.
