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

Autor:	Zi-Xiao Wang, Jie-Ran Xue, Hong-Kai Shi, Xiao-Qing Jia, Tong Lin, Li-Yu Shi, Tao Dong, Fa Wang, Nan-Lin Wang
Rok vydání:	2021
Předmět:	Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity FOS: Physical sciences
DOI:	10.48550/arxiv.2107.07488
Popis:	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 Comment: 5 pages, 4 figures
Databáze:	OpenAIRE
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