| COHERENT OPTICAL PHONON EXCITATION BY FEMTOSECOND LASER PULSE IN YBa2Cu3O7-δ THIN FILMS |
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| 引用本文： | 皮飞鹏,林位株,莫党.COHERENT OPTICAL PHONON EXCITATION BY FEMTOSECOND LASER PULSE IN YBa2Cu3O7-δ THIN FILMS[J].中国物理 B,1996,5(8):601-608. |
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| 作者姓名： | 皮飞鹏 林位株 莫党 |
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| 作者单位： | Department of Physics, Guangzhou Teachers College, Guangzhou 510400, China;Department of Physics, Zhongshan University, Guangzhou 510275, China;State Key Laboratory of Ultrafast Laser Spectroscopy, Zhongshan University, Guangzhou 510275, China;Department of Physics, Zhongshan University, Guangzhou 510275, China |
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| 摘 要： | With a correlation of nonequilibrium carriers relaxation and coherent phonons displacive excitation, the coherent optical phonon oscillations in YBa2Cu3O7-δ thin films excited by femtosecond laser pulse are simulated theoretically. It is revealed that as the oxygen concentration decreases, the coherent phonon oscillations become easier to be observed due to the decrease of the local coupling between the carriers and the lattice vibrations in the CuO2 plane.
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