太赫兹辐射
激发态
拉曼光谱
声子
光谱学
激发
物理
材料科学
光电子学
光学
原子物理学
凝聚态物理
量子力学
作者
Haw-Wei Lin,Griffin Mead,G. A. Blake
标识
DOI:10.1103/physrevlett.129.207401
摘要
Two-dimensional terahertz-terahertz-Raman spectroscopy can provide insight into the anharmonicities of low-energy phonon modes-knowledge of which can help develop strategies for coherent control of material properties. Measurements on LiNbO_{3} reveal THz and Raman nonlinear transitions between the E(TO_{1}) and E(TO_{3}) phonon polaritons. Distinct coherence pathways are observed with different THz polarizations. The observed pathways suggest that the origin of the third-order nonlinear responses is due to mechanical anharmonicities, as opposed to electronic anharmonicities. Further, we confirm that the E(TO_{1}) and E(TO_{3}) phonon polaritons are excited through resonant one-photon THz excitation.
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