Coherent phonon excitation in bismuth |
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Authors: | Alexander Q. Wu |
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Affiliation: | School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA |
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Abstract: | Ultrafast time-resolved reflectivity of a bismuth thin film evaporated on a silicon substrate is measured to investigate coherent phonons in bismuth. The reflectivity result is analyzed by a linear chirp approximation to obtain the time dependent frequencies of coherent phonons. Not only the optical modes are detected, which are generated by a combination of impulsive stimulated Raman scattering and displacive excitation of coherent phonon, acoustic phonon modes are also observed, which are emitted by the A1g optical phonon. |
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Keywords: | 63.20.Kr |
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