Observation of coherent surface optical phonon oscillations by time-resolved surface second-harmonic generation

被引:94
作者
Chang, YM
Xu, L
Tom, HWK
机构
[1] Department of Physics, University of California, Riverside, CA
关键词
D O I
10.1103/PhysRevLett.78.4649
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We demonstrate a new time-domain surface phonon spectroscopy. We excite coherent surface optical phonons with an ultrashort laser pulse and probe the free-induction decay with time-resolved surface second-harmonic generation. For both clean GaAs (110) and (100) surfaces, the signals are remarkably large due to the highly localized electron-phonon interaction at the surface and the intrinsic-surface sensitivity of second-harmonic generation. This work suggests that coherent oscillations of surface optical phonons may be used as probes of electron-phonon interactions at surfaces and to control or drive nonthermal surface chemical reactions.
引用
收藏
页码:4649 / 4652
页数:4
相关论文
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