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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.43: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Picosecond periodic oscillation modulated by Higgs amplitude mode in a superconductor-metal hybrid metasurface — •Siyu Duan^1,2, Jingbo Wu¹, Caihong Zhang¹, Kebin Fan¹, Biaobing Jin¹, and Zhe Wang² — ¹School of Electronic Science and Engineering, Nanjing University, Nanjing, China — ²Department of Physics, TU Dortmund University, Dortmund, Germany

We report on a time-resolved terahertz spectroscopic study of a superconductor-metal hybrid metasurface that is fabricated by introducing superconducting microbridges into metallic resonators. By exploiting the nonlinear response of the superconducting NbN microbridges to a multicycle narrowband terahertz excitation pulse, we observe a picosecond periodic oscillation of terahertz transmission spectra. This oscillation contains components of the fundamental frequency of the narrowband excitation pulse and its second harmonic, which we ascribe tentatively to an excited Higgs mode oscillation. Furthermore, we can modulate the amplitude and duration of periodic oscillations by changing the field strength of the terahertz excitation pulse and the sample temperature.

Keywords: nonlinear effect; ultrafast modulations; Higgs mode oscillation; terahertz metasurface