TIME-RESOLVED OBSERVATION OF COHERENT PHONONS IN GRAPHITE
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24th International Conference on the Physics of Semiconductors : Jerusalem, Israel August 2-7, 1998We report on the observation of the coherent phonons in graphite by the femtosecond pumpprobeexperiment. The transient reflectivity measurement with time-delay modulationtechnique gives the coherent phonon signal of interplanar shearing mode whose vibrationalenergy and symmetry are 42 cm-1 and E2g, respectively. We have examined the polarizationdependence of the coherent phonon signal in detail. The result indicates that the coherentphonon is generated by ISRS (Impulsive stimulated Raman scattering) process and that thesignal is detected as an interference between Rayleigh and Raman components of the reflectedprobe beam. The polarization dependence gives the clear and direct information about thesymmetry of the Raman tensor.
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