Interband Light Absorption in Semiconductor Quantum Dots Connected with the Charged and Neutral Exciton - Donor Complexes

2005 ◽  
Vol 277-279 ◽  
pp. 893-898
Author(s):  
A.P. Djotyan ◽  
A.A. Avetisyan ◽  
E.M. Kazaryan
Keyword(s):  
Quantum Dots ◽  
Oscillator Strength ◽  
Ground State ◽  
Light Absorption ◽  
Quantum Confinement ◽  
Optical Transition ◽  
Semiconductor Quantum Dots ◽  
Spherical Quantum Dot ◽  
Interband Optical Transition ◽  
Interband Light Absorption

The interband light absorption in spherical quantum dot (QD) of semiconductors connected with the charged and neutral exciton-donor complexes are studied theoretically. The oscillator strength for interband optical transition from valence band to the ground state of excitondonor complex in spherical QD has been investigate. The calculations were performed in the cases of infinite and finite potential barrier of QD. The dependences of the oscillator strength on the radius of the QD were obtained. It was shown that the quantum confinement gives rise a giant oscillator strength per impurity.

scholarly journals Увеличение эффективности тандема полупроводниковый лазер-оптический усилитель на основе самоорганизующихся 8s квантовых точек

2021 ◽  
Vol 55 (12) ◽  
pp. 1223
Author(s):  
А.Е. Жуков ◽  
Н.В. Крыжановская ◽  
Э.И. Моисеев ◽  
А.С. Драгунова ◽  
А.М. Надточий ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Excited State ◽  
Laser Diode ◽  
Ground State ◽  
Semiconductor Optical Amplifier ◽  
Optical Transition ◽  
Optical Amplifier ◽  
Rate Equations ◽  
Resonator Length ◽  
Optimal Value

The rate equations are used to analyze the characteristics of a tandem consisting of a laser diode and a semiconductor optical amplifier made of a single heterostructure with quantum dots. The optimal value of the current distribution coefficient the amplifier and the laser, as well as the optimal resonator length that provides the highest output power of the tandem were determined. It is shown that the use of the tandem allows, at the same total consumed current, to significantly (more than 4 times for 1 A) increase the power emitted through the ground-state optical transition in comparison with that achievable with a laser diode solely being limited by the onset of lasing through an excited-state optical transition.

scholarly journals Resonant Light Absorption by Semiconductor Quantum Dots

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
I. G. Lang ◽  
S. T. Pavlov
Keyword(s):  
Quantum Dots ◽  
Magnetic Fields ◽  
Cross Section ◽  
Light Absorption ◽  
Semiconductor Quantum Dots ◽  
Electric And Magnetic Fields ◽  
The Cross

The cross-section of light absorption by size-quantized semiconductor quantum dots (QD) is calculated in the case of a resonance with an exciton in cubical crystals of class. The interference of stimulating and induced electric and magnetic fields is taken into account. The cross-section of light absorption is proportional to the exciton nonradiative damping .

Theory of Addition Spectra in Double Quantum Dots: Single-Particle Tunneling vs Coulomb Interactions

1999 ◽  
Vol 571 ◽  
Author(s):  
M. Rontani ◽  
F. Rossi ◽  
F. Manghi ◽  
E. Molinari
Keyword(s):  
Quantum Dots ◽  
Ground State ◽  
Semiconductor Quantum Dots ◽  
Double Quantum ◽  
Coulomb Correlation ◽  
Coulomb Interactions ◽  
Double Quantum Dots ◽  
Quantum Transitions ◽  
New Phase ◽  
State Configuration

ABSTRACTWe study coupled semiconductor quantum dots theoretically using a generalized Hubbard approach, where intra- and inter-dot Coulomb correlation, as well as tunneling effects are described on the basis of realistic electron wavefunctions. We find that the ground-state configuration of vertically coupled double dots undergoes non-trivial quantum transitions as the inter-dot distance d changes; at intermediate values of d we predict a new phase that should be observable in the addition spectra and in the magnetization changes.

scholarly journals Direct Interband Light Absorption in Strongly Prolated Ellipsoidal Quantum Dots’ Ensemble

2008 ◽  
Vol 4 (2) ◽  
pp. 106-112 ◽  
Author(s):  
K. G. Dvoyan ◽  
D. B. Hayrapetyan ◽  
E. M. Kazaryan
Keyword(s):  
Quantum Dots ◽  
Light Absorption ◽  
Interband Light Absorption
Sign in / Sign up

Export Citation Format

Share Document