声子
拉曼散射
拉曼光谱
钛酸锶
凝聚态物理
材料科学
放松(心理学)
散射
Crystal(编程语言)
物理
光学
薄膜
纳米技术
心理学
社会心理学
计算机科学
程序设计语言
作者
Jeremy Sylvester,Rashmi Choudhary,Bharat Jalan,Feruz Ganikhanov
摘要
Ultrafast decays of the intrinsic phonon modes within 260–790 cm−1 range of frequencies, which are symmetry forbidden in the first-order Raman scattering in bulk SrTiO3 crystal, have been traced using time-resolved coherent Raman technique. The effective phonon decay times are within 0.86–1.38 ps and yield corresponding linewidths of 7.7–12.3 cm−1 for optical lattice vibrations. Symmetry breakage mechanisms related to free charged carriers resulting from vacancies do not appear to play a major role.
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