Study of electron-phonon dynamics in coherent phonon fields by using a spectral-resolved pump-probe method

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We have investigated the properties of coherent phonons using a wavelength-resolved pump-probe method, to clarify the electron-lattice dynamics in coherent phonon fields. At the excitation in the transparent region to CdTe semiconductors, the detection-energy dependence of the phonon amplitude has two peaks at the energy shifted by one-phonon frequency of CdTe from the center wavelength of the probe pulses. On the other hand, the amplitude in the opaque region shows two peaks at the energy shifted by about two times the phonon frequency. We have discussed the detection-energy dependence on the basis of the dynamical dielectric response theory. The dynamical dielectric response theory demonstrates that the detection-energy dependence observed in the transparent and opaque regions can be explained by taking into account the electronic complex dielectric function modulated by coherent phonon fields.