Theoretical study of the optical absorption and refraction index change in a cylindrical quantum dot

2008 ◽  
Vol 372 (6) ◽  
pp. 888-892 ◽  
Author(s):  
Cui-Hong Liu ◽  
Bai-Ru Xu
Keyword(s):  
Optical Absorption ◽  
Quantum Dot ◽  
Theoretical Study ◽  
Refraction Index ◽  
Index Change

scholarly journals Theoretical study of strain-dependent optical absorption in a doped self-assembled InAs/InGaAs/GaAs/AlGaAs quantum dot

2018 ◽  
Vol 9 ◽  
pp. 1075-1084
Author(s):  
Tarek A Ameen ◽  
Hesameddin Ilatikhameneh ◽  
Archana Tankasala ◽  
Yuling Hsueh ◽  
James Charles ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Quantum Dot ◽  
Mole Fraction ◽  
Theoretical Study ◽  
Energy Gap ◽  
Optical Transition ◽  
Binding Model ◽  
Self Assembled ◽  
Absorption Wavelength

A detailed theoretical study of the optical absorption in doped self-assembled quantum dots is presented. A rigorous atomistic strain model as well as a sophisticated 20-band tight-binding model are used to ensure accurate prediction of the single particle states in these devices. We also show that for doped quantum dots, many-particle configuration interaction is also critical to accurately capture the optical transitions of the system. The sophisticated models presented in this work reproduce the experimental results for both undoped and doped quantum dot systems. The effects of alloy mole fraction of the strain controlling layer and quantum dot dimensions are discussed. Increasing the mole fraction of the strain controlling layer leads to a lower energy gap and a larger absorption wavelength. Surprisingly, the absorption wavelength is highly sensitive to the changes in the diameter, but almost insensitive to the changes in dot height. This behavior is explained by a detailed sensitivity analysis of different factors affecting the optical transition energy.

scholarly journals Theoretical study of polarization dependence of carrier-induced refractive index change of quantum dot

2018 ◽  
Vol 26 (3) ◽  
pp. 2252
Author(s):  
Qingyuan Miao ◽  
Ziyi Yang ◽  
Jianji Dong ◽  
Ping-An He ◽  
Dexiu Huang
Keyword(s):  
Refractive Index ◽  
Quantum Dot ◽  
Theoretical Study ◽  
Refractive Index Change ◽  
Polarization Dependence ◽  
Index Change

POLARON IN A QUANTUM DOT UNDER AN ELECTRIC FIELD

2007 ◽  
Vol 21 (24) ◽  
pp. 1635-1642
Author(s):  
MIAN LIU ◽  
WENDONG MA ◽  
ZIJUN LI
Keyword(s):  
Quantum Dot ◽  
Electric Field ◽  
Field Intensity ◽  
Ground State Energy ◽  
Ground State ◽  
Electric Field Intensity ◽  
State Energy ◽  
Theoretical Study ◽  
The Moment ◽  
Transformation Methods

We conducted a theoretical study on the properties of a polaron with electron-LO phonon strong-coupling in a cylindrical quantum dot under an electric field using linear combination operator and unitary transformation methods. The changing relations between the ground state energy of the polaron in the quantum dot and the electric field intensity, restricted intensity, and cylindrical height were derived. The numerical results show that the polar of the quantum dot is enlarged with increasing restricted intensity and decreasing cylindrical height, and with cylindrical height at 0 ~ 5 nm , the polar of the quantum dot is strongest. The ground state energy decreases with increasing electric field intensity, and at the moment of just adding electric field, quantum polarization is strongest.

Theoretical study of excitons in GaAs quantum dot molecules obtained by nanoholes filling

2021 ◽  
Vol 124 ◽  
pp. 105614
Author(s):  
S. Tilouche ◽  
A. Sayari ◽  
M. Omri ◽  
S. Souilem ◽  
L. Sfaxi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Theoretical Study ◽  
Quantum Dot Molecules ◽  
Gaas Quantum Dot

scholarly journals Dynamical control of electron spin coherence in a quantum dot: A theoretical study

2007 ◽  
Vol 75 (20) ◽  
Author(s):  
Wenxian Zhang ◽  
V. V. Dobrovitski ◽  
Lea F. Santos ◽  
Lorenza Viola ◽  
B. N. Harmon
Keyword(s):  
Quantum Dot ◽  
Electron Spin ◽  
Theoretical Study ◽  
Spin Coherence ◽  
Dynamical Control
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