Influence of pulse width and detuning on coherent phonon generation

Article

关键词: DISPLACIVE EXCITATION;    OPTICAL CONTROL;    SINGLE-CRYSTAL;    LIGHT-PULSES;    THZ PHONONS;    OSCILLATIONS;    DYNAMICS;    MECHANISM;    SPACE;    GAAS;   

DOI  :  10.1103/PhysRevB.92.144304

来源: SCIE

【 摘 要 】

We investigated the coherent phonon generation mechanism by irradiation of an ultrashort pulse with a simple two-level model. Our derived formulation shows that both impulsive stimulated Raman scattering (ISRS) and impulsive absorption (IA) simultaneously occur, and phonon wave packets are generated in the electronic ground and excited states by ISRS and IA, respectively. We identify the dominant process from the amplitude of the phonon oscillation. For short pulse widths, ISRS is very small and becomes larger as the pulse width increases. We also show that the initial phase is dependent on the pulse width and the detuning.

【 授权许可】

Free