克尔效应
声子
太赫兹辐射
凝聚态物理
各向同性
极化(电化学)
拉曼光谱
离子键合
物理
激发
磁光克尔效应
双折射
红外线的
材料科学
光学
非线性系统
离子
化学
量子力学
物理化学
作者
Martina Basini,Mattia Udina,Matteo Pancaldi,Vivek Unikandanunni,Stefano Bonetti,Lara Benfatto
出处
期刊:Physical review
日期:2024-01-18
卷期号:109 (2)
被引量:1
标识
DOI:10.1103/physrevb.109.024309
摘要
The THz Kerr effect measures the birefringence induced in an otherwise isotropic material by a strong THz pulse driving the Raman-active excitations of the systems. Here we provide experimental evidence of a sizable Kerr response in insulating ${\mathrm{SrTiO}}_{3}$ due to infrared-active lattice vibrations. Such a signal, named the ionic Kerr effect, is associated with the simultaneous excitation of multiple phonons. Thanks to a theoretical modeling of the time, polarization, and temperature dependence of the birefrengence, we can disentangle the ionic Kerr effect from the off-resonant electronic excitations, providing an alternative tunable mechanism to modulate the refractive index on ultrashort timescales via infrared active phonons.
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