Giant exciton-light coupling in large size semiconductor quantum dots

2002 ◽  
Vol 737 ◽  
Author(s):  
Bernard Gil ◽  
Alexey V. Kavokin
Keyword(s):  
Quantum Dots ◽  
Electromagnetic Field ◽  
Decay Time ◽  
Coupling Strength ◽  
Radiative Decay ◽  
Electronic States ◽  
Semiconductor Quantum Dots ◽  
Bulk Properties ◽  
Large Size ◽  
Light Coupling

ABSTRACTWe investigate the strength of the coupling of the electronic states with the electromagnetic field in semiconductor nanospheres, taking into account the retardation effect. We show that the coupling strength is particularly strong: the bulk properties are so enhanced that the radiative decay time can reach some 30 picoseconds for quantum dots sizes of some 30 nm.

Optical Properties of Wurtzite GaN and ZnO Quantum Dots

2004 ◽  
Vol 818 ◽  
Author(s):  
Vladimir A. Fonoberov ◽  
Alexander A. Balandin
Keyword(s):  
Quantum Dots ◽  
Decay Time ◽  
Radiative Decay ◽  
State Energy ◽  
Energy Gap ◽  
Dead Layer ◽  
Bulk Gan ◽  
Piezoelectric Field ◽  
Zno Quantum Dots ◽  
Valence Bands

AbstractWe have investigated exciton states in wurtzite GaN/AlN and ZnO quantum dots. A strong piezoelectric field in GaN/AlN quantum dots is found to tilt conduction and valence bands, thus pushing the electron to the top and the hole to the bottom of the GaN/AlN quantum dot. As a result, the exciton ground state energy in GaN/AlN quantum dots with heights larger than 3 nm exhibits a red shift with respect to bulk GaN energy gap. It is shown that the radiative decay time in GaN/AlN quantum dots is large and increases from 0.3 ns for quantum dots with height 1.5 nm to 1.1×103 ns for the quantum dots with height 4.5 nm. On the contrary, the electron and the hole are not separated in ZnO quantum dots. Moreover, a relatively thick “dead layer” is formed near the surface of ZnO quantum dots. As a result, the radiative decay time in ZnO quantum dots is small and decreases from 73 ps for quantum dots with diameter 1.5 nm to 29 ps for the quantum dots with diameter 6 nm.

Spectroscopic study of oscillator strength and radiative decay time of colloidal CdSe quantum dots

2018 ◽  
Vol 50 (2) ◽  
Author(s):  
Abdelnasser Aboulfotouh ◽  
Mohamed Fikry ◽  
Mona Mohamed ◽  
Magdy Omar ◽  
Hossam Rady ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spectroscopic Study ◽  
Oscillator Strength ◽  
Decay Time ◽  
Radiative Decay ◽  
Cdse Quantum Dots

scholarly journals Excitonic exchange effects on the radiative decay time of monoexcitons and biexcitons in quantum dots

2006 ◽  
Vol 74 (20) ◽  
Author(s):  
Gustavo A. Narvaez ◽  
Gabriel Bester ◽  
Alberto Franceschetti ◽  
Alex Zunger
Keyword(s):  
Quantum Dots ◽  
Decay Time ◽  
Radiative Decay ◽  
Exchange Effects
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