Ultrafast Phase Transitions in Solids, at International School of Atomic and Molecular Spectroscopy (Erice, Sicily, Italy), Saturday, May 24, 2003:
    In this talk we present the coherent excitation and coherent control of the A1 phonon mode in Te. First, the underlying theory about the excitation of the A1 phonon mode, and only this, in a certain class of materials is discussed. The theory, called Displacive Excitation of Coherent Phonons (DECP), predicts the excitation of the A1 phonon mode as a result of electronic excitation following absorption of an ultrashort laser pulse by the material. Since there is no symmetry breaking mechanism in the electronic excitation through absorption the effect can only take place in materials which... Read more about Ultrafast Phase Transitions in Solids