FeSe$_{0.5}$Te$_{0.5}$中二维涡旋运动的皮秒轨迹：太赫兹二次谐波产生可视化
Picosecond Trajectory of Two-dimensional Vortex Motion in FeSe$_{0.5}$Te$_{0.5}$ Visualized by Terahertz Second Harmonic Generation
AI总结：
本研究通过太赫兹二次谐波产生可视化FeSe$_{0.5}$Te$_{0.5}$薄膜中二维涡旋的皮秒轨迹，发现其质量轻如裸电子，揭示了高频下涡旋核心独立于准粒子的运动。
摘要：
我们通过观测太赫兹频率范围内的二次谐波产生（SHG），研究了铁基超导体FeSe$_{0.5}$Te$_{0.5}$薄膜中的涡旋动力学。我们可视化了在由迈斯纳屏蔽电流倾斜的钉扎势中二维涡旋运动的皮秒轨迹。观测到垂直于驱动场的SHG，对应于电流诱导的反演对称性破缺下的非互易非线性霍尔效应，而线性霍尔效应可忽略不计。估计的涡旋质量轻如裸电子，表明在这样的高频和大速度（约300 km/s）下，涡旋核心独立于准粒子运动。
英文摘要：
We have investigated the vortex dynamics in a thin film of an iron-based superconductor FeSe$_{0.5}$Te$_{0.5}$ by observing second-harmonic generation (SHG) in the THz frequency range. We visualized the picosecond trajectory of two-dimensional vortex motion in a pinning potential tilted by Meissner shielding current. The SHG perpendicular to the driving field is observed, corresponding to the nonreciprocal nonlinear Hall effect under the current-induced inversion symmetry breaking, whereas the linear Hall effect is negligible. The estimated vortex mass, as light as a bare electron, suggests that the vortex core moves independently from quasiparticles at such a high frequency and large velocity $\approx$300 km/s.
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