1998-07
AUTHORS ABSTRACTCreation and detection of states of the phonon field are discussed. I briefly compare phonon coherent states (PCS) with Fock and thermal states in two harmonic systems, the diatomic molecules and a non-conducting crystal with local centers. I analyze some of the phenomenology suggesting the cases where PCS are generated and report on their unmistakable fingerprint: the Poisson distribution among the Fock states and the oscillating Gaussian of the displaced oscillator generated in ultrafast processes. The PCS created in the “pump and probe” femtosecond spectroscopy are specially commented. The motion of PCS is seen to be responsible of the persistent oscillations discovered at ultrashort times, but also, in rare cases, of a very fast decay when a true acoustical PCS is created by the ultrafast excitation. More... »
PAGES899-905
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