Abstract
We have investigated the spectrally resolved coherent phononoscillation in semimetals of Sb and Bi. The oscillation initial phase isπ-shifted for the high- and low-frequency components of the probe pulse, indicating that notonly the integrated intensity, but also the spectral content of the probe, are a function oftime delay. This means that the coherent phonon, corresponding to nuclear motion, is awavepacket localized in different regions of the phase space. Furthermore, the spectralfiltering results in the appearance of the signal for negative delay time with thesimultaneous disappearance of the coherent artefact. We conjecture that all these findingsare the indication of the non-classical nature of coherent phonons that has beenearlier inferred from squeezing and revivals of the lattice mode in semimetals.
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