Coulomb and carrier-activation dynamics of resonantly excited InAs/GaAs quantum dots in two-color pump-probe experiments

被引：26

作者：

Quochi, F ^{[1
]}

Dinu, M

Pfeiffer, LN

West, KW

Kerbage, C

Windeler, RS

Eggleton, BJ

机构：

[1] Lucent Technol, Bell Labs, Holmdel, NJ 07733 USA

[2] Lucent Technol, Bell Labs, Murray Hill, NJ 07940 USA

[3] OFS Labs, Murray Hill, NJ 07940 USA

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.67.235323

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study Coulomb and carrier dynamics in self-assembled InAs/GaAs quantum dots at room temperature by two-color tunable differential transmission experiments, with resonant excitation in the ground state. Coulomb renormalization of the first excited state in the presence of one electron-hole pair in the ground state manifests as a 6-meV redshift. Several time scales for carrier activation to the first excited state are distinguished, corresponding to activation processes occurring in singly and doubly occupied dots, including carrier thermalization. Electron thermal activation occurs on a 250 ps time scale, confirming the absence of a phonon bottleneck at room temperature.

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页数：5

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