We present time-resolved photoluminescence measurements of InAs/GaAs quantum dots showing a relevant interplay between recombination kinetics and thermalization processes. By time-resolved and steady-state measurements we experimentally demonstrate that the thermal population of optically inactive states fully accounts for the increase of the intrinsic radiative lifetime in quantum dots when the lattice temperature raises. Experimental data are compared with model predictions for the electronic structure of the quantum dot, and the dark optical transitions involved in the thermalization nicely correspond to the first-hole-excited levels. In addition, the observation of thermalization between the electronic levels allows us to estimate the relaxation time to the ground state, which turns out to be in the ps time scale.
Recombination kinetics of InAs quantum dots:Role of thermalization in dark states / M.Gurioli;A.Vinattieri;M.Zamfirescu;M.Colocci;S.Sanguinetti;R.Noetzel. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 73:(2006), pp. 085302-1-085302-6. [10.1103/PhysRevB.73.085302]
Recombination kinetics of InAs quantum dots:Role of thermalization in dark states
GURIOLI, MASSIMO;VINATTIERI, ANNA;COLOCCI, MARCELLO;
2006
Abstract
We present time-resolved photoluminescence measurements of InAs/GaAs quantum dots showing a relevant interplay between recombination kinetics and thermalization processes. By time-resolved and steady-state measurements we experimentally demonstrate that the thermal population of optically inactive states fully accounts for the increase of the intrinsic radiative lifetime in quantum dots when the lattice temperature raises. Experimental data are compared with model predictions for the electronic structure of the quantum dot, and the dark optical transitions involved in the thermalization nicely correspond to the first-hole-excited levels. In addition, the observation of thermalization between the electronic levels allows us to estimate the relaxation time to the ground state, which turns out to be in the ps time scale.File | Dimensione | Formato | |
---|---|---|---|
PhysRevB.73.085302.pdf
Accesso chiuso
Tipologia:
Versione finale referata (Postprint, Accepted manuscript)
Licenza:
Tutti i diritti riservati
Dimensione
149.06 kB
Formato
Adobe PDF
|
149.06 kB | Adobe PDF | Richiedi una copia |
abstr_marcello_314447.pdf
accesso aperto
Tipologia:
Altro
Licenza:
Open Access
Dimensione
14.97 kB
Formato
Adobe PDF
|
14.97 kB | Adobe PDF |
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.