Optical absorption in semiconductor quantum dots coupling to dispersive phonons of infinite modes

2012 ◽  
Vol 112 (7) ◽  
pp. 074324
Author(s):  
Zhiwen Ding ◽  
Qin Wang ◽  
Hang Zheng
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Semiconductor Quantum Dots

ENERGY STATES IN QUANTUM DOTS

2002 ◽  
Vol 12 (01) ◽  
pp. 15-43 ◽  
Author(s):  
ANDREW J. WILLIAMSON
Keyword(s):  
Quantum Dots ◽  
Absorption Spectrum ◽  
Electronic Structure ◽  
Optical Absorption ◽  
Configuration Interaction ◽  
Single Particle ◽  
Optical Absorption Spectrum ◽  
Semiconductor Quantum Dots ◽  
Binding Energies ◽  
Particle Level

We describe a procedure for calculating the electronic structure of semiconductor quantum dots containing over one million atoms. The single particle electron levels are calculated by solving a Hamiltonian constructed from screened atomic pseudopotentials. Effects beyond the single particle level such as electron and hole exchange and correlation interactions are described using a configuration interaction (CI) approach. Application of these methods to the calculation of the optical absorption spectrum, Coulomb repulsions and multi-exciton binding energies of InGaAs self-assembled quantum dots are presented.

Effect of size dispersion on the optical absorption of an ensemble of semiconductor quantum dots

1998 ◽  
Vol 32 (11) ◽  
pp. 1229-1233 ◽  
Author(s):  
M. I. Vasilevskii ◽  
E. I. Akinkina ◽  
A. M. de Paula ◽  
E. V. Anda
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Semiconductor Quantum Dots ◽  
Size Dispersion

Optical absorption in semiconductor quantum dots: A tight-binding approach

1993 ◽  
Vol 47 (12) ◽  
pp. 7132-7139 ◽  
Author(s):  
Lavanya M. Ramaniah ◽  
Selvakumar V. Nair
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Tight Binding ◽  
Semiconductor Quantum Dots

Optical absorption study of 100-MeV chlorine ion-irradiated hydroxyl-free ZnO semiconductor quantum dots

2002 ◽  
Vol 92 (12) ◽  
pp. 7149-7152 ◽  
Author(s):  
D. Mohanta ◽  
S. S. Nath ◽  
A. Bordoloi ◽  
A. Choudhury ◽  
S. K. Dolui ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Semiconductor Quantum Dots ◽  
Absorption Study ◽  
Optical Absorption Study ◽  
Chlorine Ion ◽  
Zno Semiconductor

Fabrication of III-V Semiconductor Quantum Dots in Porous Glass.

1988 ◽  
Vol 144 ◽  
Author(s):  
John C. Luong ◽  
Nicholas F. Borrelli
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Porous Glass ◽  
Microwave Plasma ◽  
Semiconductor Quantum Dots ◽  
Theoretical Interest ◽  
Quantum Size ◽  
Quantum Confined ◽  
Organometallic Precursors ◽  
Mocvd Technique

ABSTRACTSpatially quantized systems of III–V compounds have, in recent years, attracted considerable theoretical interest. However, the fabrication of quantum dots, a three-dimensionally quantum-confined microstructure, is particularly cumbersome and requires sophisticated lateral patterning techniques. A method, reported recently, which utilizes the microporosity of Vycor brand porous glass to produce quantum-confined microcrystals of II–VI and IV–VI semiconductors, is now extended to the fabrication of III–V quantum dots, by incorporating a microwave plasma assisted MOCVD technique. In this process, organometallic precursors impregnated in porous glass can be effectively cracked to deposit III–V microcrystals in glass. The results are discussed in light of the quantum size effect manifested by the optical absorption and photoluminescence data.

QUANTUM CONFINEMENT AND COULOMB EFFECTS IN SEMICONDUCTOR QUANTUM DOTS

1990 ◽  
Vol 04 (16) ◽  
pp. 1009-1016 ◽  
Author(s):  
Y.Z. HU ◽  
S.W. KOCH ◽  
D.B. TRAN THOAI
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Quantum Confinement ◽  
Semiconductor Quantum Dots ◽  
Optical Absorption Spectra ◽  
Electron Hole ◽  
Quantum Confinement Effects ◽  
Electron Hole Pair ◽  
Coulomb Effects

Coulomb and quantum confinement effects in small semiconductor microcrystallites are analyzed. Energies and wavefunctions for one- and two-electron-hole-pair states are computed and optical absorption spectra are evaluated.

Dependence of the Absorption Spectra of III-V Semiconductor Quantum Dots on the Size Distribution

2007 ◽  
Vol 31 ◽  
pp. 59-61
Author(s):  
Subindu Kumar ◽  
Dipankar Biswas ◽  
Tapas Das
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Size Distribution ◽  
Absorption Spectra ◽  
Gaussian Function ◽  
Semiconductor Quantum Dots ◽  
Optical Absorption Spectra

In recent years there have been extensive studies on III-V semiconductor quantum dots (QDs). In this paper we have formulated the absorption spectra of a realistic QD system with dot size distribution described by a Gaussian function. The dots were approximated as cubic boxes having finite potentials at the boundaries. The effects of size non uniformity on the optical absorption spectra of a realistic QD system was analyzed and the results have been compared with ideal dots having infinite potentials at the boundaries.

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