Transient Higgs oscillations and high-order nonlinear light-Higgs coupling in a terahertz wave driven NbN superconductor
Zi-Xiao Wang, Jie-Ran Xue, Hong-Kai Shi, Xiao-Qing Jia, Tong Lin, Li-Yu Shi, Tao Dong, Fa Wang, Nan-Lin Wang
DOI 10.1103/PhysRevB.105.L100508 · Physical Review B
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Abstract
We study the nonlinear optical response in a superconducting NbN thin film with a strong terahertz (THz) wave. In. addition to the expected third-harmonic generation, we observe a transient oscillation which softens in frequency with temperature increasing towards the superconducting transition temperature Tc. We identify this feature as transient Higgs oscillation. To verify this proposal, we introduce a time-frequency resolved technique, a spectrogram for visualizing the THz spectrum. The dynamic decaying behavior of the oscillation is observed, which is consistent with the theoretical expectation of intrinsic Higgs oscillation. Moreover, we observe a higher-order nonlinear optics effect, i.e., fifth-harmonic generation, which we assign to the higher-order coupling between the Higgs mode and electromagnetic field.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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