TY - JOUR
T1 - Picosecond Trajectory of Two-Dimensional Vortex Motion in FeSe0.5Te0.5 Visualized by Terahertz Second Harmonic Generation
AU - Nakamura, Sachiko
AU - Matsumoto, Haruki
AU - Ogawa, Hiroki
AU - Kobayashi, Tomoki
AU - Nabeshima, Fuyuki
AU - Maeda, Atsutaka
AU - Shimano, Ryo
N1 - Publisher Copyright:
© 2024 American Physical Society.
PY - 2024/7/19
Y1 - 2024/7/19
N2 - We have investigated the vortex dynamics in a thin film of an iron-based superconductor FeSe0.5Te0.5 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.
AB - We have investigated the vortex dynamics in a thin film of an iron-based superconductor FeSe0.5Te0.5 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.
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U2 - 10.1103/PhysRevLett.133.036004
DO - 10.1103/PhysRevLett.133.036004
M3 - Article
C2 - 39094164
AN - SCOPUS:85199361001
SN - 0031-9007
VL - 133
JO - Physical review letters
JF - Physical review letters
IS - 3
M1 - 036004
ER -