Picosecond Trajectory of Two-dimensional Vortex Motion in FeSe${}_{0.5}$Te${}_{0.5}$ Visualized by Terahertz Second Harmonic Generation

Abstract

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.

6 pages, 4 figures

References in corpus (20)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
• Superconducting properties and Hall Effect of epitaxial NbN thin films
• Exotic Superconducting States in FeSe-based Materials
• Epitaxial growth of FeSe${}_{0.5}$Te${}_{0.5}$ thin films on CaF${}_2$ substrates with high critical current density
• Superconductivity and Local Inversion-Symmetry Breaking
• Tunable vortex Majorana zero modes in LiFeAs superconductor
• Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films
• Rising speed limits for fluxons via edge quality improvement in wide MoSi thin films
• Nonreciprocal optical response in parity-breaking superconductors
• Vortex jets generated by edge defects in current-carrying superconductor thin strips
• Vortex matching effect in engineered thin films of NbN
• Nonlinear optical responses in noncentrosymmetric superconductors
• Exceptional Suppression of Flux-Flow Resistivity in FeSe${}_{0.4}$Te${}_{0.6}$ by Back-Flow from Excess Fe Atoms and Se/Te Substitutions
• Dynamical vortex phase diagram of 2D superconductivity in gated MoS2
• Direct observation of quantum anomalous vortex in Fe(Se,Te)
• Interaction between moving Abrikosov vortices in type-II superconductors
• Current distributions by moving vortices in superconductors
• Microwave flux-flow Hall effect in a multi-band superconductor FeSe
• Magnus effect on a Majorana zero-mode

Cited by in corpus (3)

• Temporal modulation of second harmonic generation in ferroelectrics by a pulsed electric field
• Vortex Mass in Superfluid Fermi Gases along the BEC-BCS Crossover
• Effect of Population Imbalance on Vortex Mass in Superfluid Fermi Gases