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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 terahertz frequency range. We visualize...d 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.続きを見る
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Mendeley出力
