Femtosecond time-resolved x-ray diffraction from optical coherent phonons in CdTe(111) crystal

摘要

Coherent phonons excited in a CdTe( 111) crystal by 70 fs laser irradiation have been investigated by femtosecond time-resolved x-ray diffraction. The longitudinal optical phonon with a frequency of approximately 5 THz near the Brillouin zone center has been detected as modulation in intensities of x-ray diffraction. Atomic displacement in the [111] direction in the coherent longitudinal optical phonon has been estimated.