Picosecond Trajectory of Two-Dimensional Vortex Motion in FeSe_{0.5}Te_{0.5} Visualized by Terahertz Second Harmonic Generation

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 visualized the picosecond trajectory of two-dimensional vortex motion in a pinning potential tilted by Meissne...

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Bibliographic Details
Published in:Physical review letters 2024-07, Vol.133 (3), p.036004
Main Authors: Nakamura, Sachiko, Matsumoto, Haruki, Ogawa, Hiroki, Kobayashi, Tomoki, Nabeshima, Fuyuki, Maeda, Atsutaka, Shimano, Ryo
Format: Article
Language:English
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Summary: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 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.
ISSN:1079-7114
1079-7114
DOI:10.1103/PhysRevLett.133.036004