Transient Higgs oscillations and high-order nonlinear light-Higgs coupling in terahertz-wave drivenNbN superconductor

Abstract

We study the nonlinear optical response in a superconducting NbN thin film with strong terahertz (THz)wave. Besides the expected third harmonic generation, we observe a new transient oscillation which softensin frequency with temperature increasing towards superconducting transition temperatureTc. We identify thisnew mode as the Higgs transient oscillation. To verify this proposal, we introduce a time-frequency resolvedtechnique, named spectrogram for visualizing THz spectrum. The dynamic decaying behavior of the mode isobserved, which is consistent with theoretical expectation about intrinsic Higgs oscillation. Moreover, a higherorder nonlinear optics effect,i.e.fifth harmonic generation, has been observed for the first time, which we assignto the higher order coupling between Higgs mode and electromagn

arXiv comment5 pages, 4 figures

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Cited by in corpus (10)

• High-order nonlinear terahertz probing of the two-band superconductor MgB${}_2$: Third- and fifth-order harmonic generation
• Quench-drive spectroscopy and high-harmonic generation in BCS superconductors
• Revealing the frequency-dependent oscillations in the nonlinear terahertz response induced by the Josephson current
• Quench-drive spectroscopy of cuprates
• Direct observation of the Higgs particle in a superconductor by non-equilibrium Raman scattering
• Higgs physics in superconductors
• Two-dimensional coherent spectroscopy of disordered superconductors in the narrow-band and broad-band limits
• Two-dimensional THz spectroscopy in electronic systems: a many-body diagrammatic approach
• Anomalous terahertz nonlinearity in disordered s-wave superconductor close to the superconductor-insulator transition
• Third-harmonic generation in superconductors: Role of quantum geometry in the competition between Higgs mode and quasiparticles