Modeling of Phonon Dispersion in a Semiconductor Quantum Dot Crystal

2002 ◽  
Vol 731 ◽  
Author(s):  
Olga L. Lazarenkova ◽  
Alexander A. Balandin
Keyword(s):  
Quantum Dot ◽  
Phonon Spectrum ◽  
Acoustic Phonon ◽  
Phonon Dispersion ◽  
Three Dimensional ◽  
Semiconductor Quantum Dots ◽  
Low Energy ◽  
Band Formation ◽  
Carrier Relaxation ◽  
Semiconductor Quantum Dot

AbstractWe describe a model for numerical calculation of phonon spectrum in a three-dimensional regimented array of semiconductor quantum dots. Regimentation and possibility of carrier mini-band formation make this structure analogous to a crystal, e.g.quantum dot crystal. It is demonstrated that the acoustic phonon dispersion undergoes strong modification in such a structure leading to emergence of low-energy quasi-optical branches. Strong phonon spectrum modification is expected to affect carrier relaxation and transport properties.

TIME DOMAIN DESCRIPTION OF THE GROUP VELOCITY MANIPULATION USING SEMICONDUCTOR QUANTUM DOTS

2009 ◽  
Vol 18 (04) ◽  
pp. 573-581
Author(s):  
QIGUANG YANG ◽  
JAETAE SEO ◽  
BAGHER TABIBI ◽  
WILLIAM YU ◽  
GUOLONG TAN ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Group Velocity ◽  
Time Domain ◽  
Semiconductor Quantum Dots ◽  
Optical Pulses ◽  
Semiconductor Quantum Dot ◽  
Domain Description ◽  
The Time Domain

The slow and fast propagation phenomena of optical pulses in a single semiconductor quantum dot have been investigated in the time domain. It was found that both the advancement and the slowdown of a pulse might be fulfilled by using the finite response nature of the semiconductor quantum dot.

Self-organized growth of three-dimensional IV–VI semiconductor quantum dot crystals with fcc-like vertical stacking and tunable lattice constant

2000 ◽  
Vol 454-456 ◽  
pp. 657-670 ◽  
Author(s):  
G. Springholz ◽  
M. Pinczolits ◽  
V. Holy ◽  
P. Mayer ◽  
K. Wiesauer ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Lattice Constant ◽  
Three Dimensional ◽  
Semiconductor Quantum Dot ◽  
Self Organized

THE INFLUENCE OF ENVIRONMENTAL EFFECTS ON THE ACOUSTIC PHONON SPECTRA IN QUANTUM-DOT HETEROSTRUCTURES

2002 ◽  
Vol 12 (04) ◽  
pp. 1147-1158 ◽  
Author(s):  
SALVADOR RUFO ◽  
MITRA DUTTA ◽  
MICHAEL A. STROSCIO
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Environmental Effects ◽  
Phonon Spectrum ◽  
Acoustic Phonon ◽  
Matrix Material ◽  
Free Standing ◽  
Phonon Spectra ◽  
The Matrix ◽  
Selection Of

We present calculations of the acoustic phonon spectra for a variety of quantum dots and consider the cases where the quantum dots are both free-standing and embedded in a selection of different matrix materials — including semiconductors, plastic, and water. These results go beyond previous calculations for free-standing quantum dots and demonstrate that the matrix material can have a large effect on the acoustic phonon spectrum and consequently on a variety of phonon-assisted transitions in quantum-dot heterostructures.

scholarly journals From Random Telegraph to Gaussian Stochastic Noises: Decoherence and Spectral Diffusion in a Semiconductor Quantum Dot

2010 ◽  
Vol 2010 ◽  
pp. 1-13 ◽  
Author(s):  
A. Berthelot ◽  
C. Voisin ◽  
C. Delalande ◽  
Ph. Roussignol ◽  
R. Ferreira ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Gaussian Noise ◽  
Theoretical Description ◽  
Semiconductor Quantum Dots ◽  
Spectral Diffusion ◽  
Jump Processes ◽  
Quantitative Interpretation ◽  
Semiconductor Quantum Dot ◽  
Stochastic Noises

We present a general theoretical description of the extrinsic dephasing mechanism of spectral diffusion that dominates the decoherence dynamics in semiconductor quantum dots at low temperature. We discuss the limits of random telegraph and Gaussian stochastic noises and show that the combination of both approaches in the framework of the pre-Gaussian noise theory allows a quantitative interpretation of high-resolution experiments in single semiconductor quantum dots. We emphasize the generality and the versatility of our model where the inclusion of asymmetric jump processes appears as an essential extension for the understanding of semiconductor quantum dot physics.

A general strategy for semiconductor quantum dot production

Nanoscale ◽  
2021 ◽  
Author(s):  
Yuanqing Xu ◽  
Weibiao Wang ◽  
Zhexue Chen ◽  
Xinyu Sui ◽  
Aocheng Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Mass Production ◽  
Semiconductor Quantum Dots ◽  
General Strategy ◽  
Bulk Materials ◽  
Semiconductor Quantum Dot

Mass production of semiconductor quantum dots (QDs) from bulk materials is highly desired but far from satisfactory. Herein, we report a general strategy capable of mechanically tailoring semiconductor bulk materials...

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