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- Title
Revealing the frequency-dependent oscillations in the nonlinear terahertz response induced by the Josephson current.
- Authors
Zhang, Sijie; Sun, Zhiyuan; Liu, Qiaomei; Wang, Zixiao; Wu, Qiong; Yue, Li; Xu, Shuxiang; Hu, Tianchen; Li, Rongsheng; Zhou, Xinyu; Yuan, Jiayu; Gu, Genda; Dong, Tao; Wang, Nanlin
- Abstract
Nonlinear responses of superconductors to intense terahertz radiation has been an active research frontier. Using terahertz pump-terahertz probe spectroscopy, we investigate the c -axis nonlinear optical response of a high-temperature superconducting cuprate. After excitation by a single-cycle terahertz pump pulse, the reflectivity of the probe pulse oscillates as the pump-probe delay is varied. Interestingly, the oscillatory central frequency scales linearly with the probe frequency, a fact widely overlooked in pump-probe experiments. By theoretically solving the nonlinear optical reflection problem on the interface, we show that our observation is well explained by the Josephson-type third-order nonlinear electrodynamics, together with the emission coefficient from inside the material into free space. The latter results in a strong enhancement of the emitted signal whose physical frequency is around the Josephson plasma edge. Our result offers a benchmark for and new insights into strong-field terahertz spectroscopy of related quantum materials.
- Subjects
NONLINEAR oscillations; HIGH temperature superconductors; TERAHERTZ spectroscopy; SUBMILLIMETER waves; OPTICAL reflection
- Publication
National Science Review, 2023, Vol 10, Issue 11, p1
- ISSN
2095-5138
- Publication type
Article
- DOI
10.1093/nsr/nwad163