Generation of large coherent phonon amplitude via coherent controlof electron system

由于实现相干声子软化的步骤只源于晶格的非谐性，我们主要做了以下两个实验：第一，在脉冲串激发下，我们观察到了大幅度的相干声子，同时抑制了多光子吸收。此外，我们还观察到了cdSe量子点中的相干声子振荡，这可以归结为一个二能级系统

As steps to realize coherent phonon softening originated only fromlattice anharmonicity,We performed mainly two experiments below.First, by a pulse train excitation, we observed large amplitude of coherent phonon withsuppressing multi-photon absorption. This suggests a possibility of phonon softeningkeeping low temperature electron system.In addition, we observed coherent phonon oscillations in CdSe quantum dots which can beregarded as a two-level system