Femtosecond dynamics of electron capture and decapture in a single quantum well structure

摘要

Abstract: Electron capturing and de-capturing dynamics in a single semiconductor quantum well due to the interaction with longitudinal optical phonons are studied by directly solving the time-dependent Schrodinger equation. Time-dependent wave functions are calculated with an initial electron wave packet impinging on the quantum well, being reflected and transmitted, captured into and de-captured from the quantum well. We have obtained new information on electron capture and de-capture times as function of electron-phonon coupling strength. The red energy shift of ground state energy is also found to be linearly proportional to the electron- phonon interaction strength. These results can not be simply obtained using Fermi Golden Rule.!3