Exciton relaxation dynamics in quantum dots with strong confinement

被引：28

作者：

Vollmer, M ^{[1
]}

Mayer, EJ ^{[1
]}

Ruhle, WW ^{[1
]}

Kurtenbach, A ^{[1
]}

Eberl, K ^{[1
]}

机构：

[1] MAX PLANCK INST FESTKORPERFORSCH,D-70569 STUTTGART,GERMANY

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.54.R17292

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the investigation of exciton relaxation, as traced by time-resolved photoluminescence, in nanoscale InP islands embedded in an In0.48Ga0.52P matrix. Excitons are generated in excited, high-energy states. Depending on excitation energy, up to three LO-phonon replicas into lower-energy exciton states are observed. The rise of all phonon replicas, which we attribute to the LO-phonon emission time, is faster than 10 ps, our time resolution. Their 1/e decay times, which we attribute to acoustical-phonon scattering times, vary between 20 and 50 ps with decreasing energy of the excited exciton states. The exciton ground state is populated by acoustical phonon emission in several tens of picoseconds.

引用

页码：17292 / 17295

页数：4

共 23 条

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