Dynamic saturation of an intersublevel transition in self-organized InAs/InxAl1-xAs quantum dots

Article

关键词: ELECTRON RELAXATION;    PHONON BOTTLENECK;    ENERGY RELAXATION;    CARRIER CAPTURE;    INALAS/INP(001);    ABSORPTION;    LIFETIME;   

DOI  :  10.1103/PhysRevB.67.205329

来源: SCIE

【 摘 要 】

We have observed a dynamic saturation of an intersublevel transition in InAs/InxAl1-xAs quantum dots related to the discrete nature of electron states using midinfrared femtosecond spectroscopy. This dynamic saturation is a consequence of the gradual filling of the discrete quantum-dot electron states due to the capture of electrons injected in the barrier. Our interpretation of the differential transmission experiments is confirmed by a comparison with a rate-equation model with the capture and intersublevel relaxation time as fit parameters yielding 10 ps and 1 ps, respectively. We discuss the mechanism responsible for these relaxation times.

【 授权许可】

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