Ultrafast microscopy of a twisted plasmonic spin skyrmion
Ultrafast microscopy of a twisted plasmonic spin skyrmion
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DOI：
10.1063/5.0084482
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发表时间：
2022-03-01
影响因子：
15
通讯作者：
Petek, Hrvoje
中科院分区：
文献类型：
--
作者：
Dai, Yanan;Zhou, Zhikang;Petek, Hrvoje
我们报道了一个瞬态等离子体自旋斯基米子拓扑准粒子在表面等离子体极化子漩涡中，并通过分析建模和超快干涉时间分辨光电发射电子显微镜对其形成的成像进行了描述。我们的模型发现，在金属/真空界面的真空侧存在扭曲的斯基米子自旋纹理，而在金属界面的真空侧则存在其完整的相反纹理。形成刺猬结构的skyrmion对与共旋反平行电场和磁场有关，这些电场和磁场形成强烈的伪标量e- b焦点，打破了局部时间反转对称性，并可以驱动轴子物理学感兴趣的磁电响应。通过非线性双光子光电发射，以纳米空间和飞秒时间分辨率记录了等离子体矢量涡旋场演化的阿秒精度图像，并由此导出了扭曲等离子体自旋粒子的拓扑织构、边界和拓扑电荷；模型和实验测量建立了一个量子化的整数光子拓扑电荷，该电荷在光产生脉冲包络上是稳定的。由AIP出版社独家授权出版。
We report a transient plasmonic spin skyrmion topological quasiparticle within surface plasmon polariton vortices, which is described by analytical modeling and imaging of its formation by ultrafast interferometric time-resolved photoemission electron microscopy. Our model finds a twisted skyrmion spin texture on the vacuum side of a metal/vacuum interface and its integral opposite counterpart in the metal side. The skyrmion pair forming a hedgehog texture is associated with co-gyrating anti-parallel electric and magnetic fields, which form intense pseudoscalar E.B focus that breaks the local time-reversal symmetry and can drive magnetoelectric responses of interest to the axion physics. Through nonlinear two-photon photoemission, we record attosecond precision images of the plasmonic vectorial vortex field evolution with nanometer spatial and femtosecond temporal (nanofemto) resolution, from which we derive the twisted plasmonic spin skyrmion topological textures, their boundary, and topological charges; the modeling and experimental measurements establish a quantized integer photonic topological charge that is stable over the optical generation pulse envelope. Published under an exclusive license by AIP Publishing.