Picosecond Trajectory of Two-dimensional Vortex Motion in FeSeTe Visualized by Terahertz Second Harmonic Generation
arXiv:2401.07397 · doi:10.1103/PhysRevLett.133.036004
Abstract
We have investigated the vortex dynamics in a thin film of an iron-based superconductor FeSeTe 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 300 km/s.
arXiv comment6 pages, 4 figures
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