Micro-photoluminescence of isolated hexagonal GaN/AlN quantum dots : role of the electron-hole dipole

2007 ◽  
Author(s):  
R. Bardoux ◽  
T. Guillet ◽  
P. Lefebvre ◽  
T. Taliercio ◽  
T. Bretagnon ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Hole

Exciton Fine Structure in Lead Chalcogenide Quantum Dots: Valley Mixing and Crucial Role of Intervalley Electron–Hole Exchange

Nano Letters ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 8897-8902
Author(s):  
Ivan D. Avdeev ◽  
Mikhail O. Nestoklon ◽  
Serguei V. Goupalov
Keyword(s):  
Quantum Dots ◽  
Fine Structure ◽  
Crucial Role ◽  
Lead Chalcogenide ◽  
Electron Hole

Optical Properties of Cds Quantum Dots: The Key Role of the Spin-Orbit and Coulomb Interactions

1999 ◽  
Vol 571 ◽  
Author(s):  
M. Chamarro ◽  
V. Voliotis ◽  
M. Dib ◽  
T. Gacoin ◽  
C. Delerue ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Tight Binding ◽  
Spin Orbit ◽  
Coulomb Interactions ◽  
Electron Hole ◽  
Small Quantum ◽  
Cds Quantum Dot ◽  
Growth Method ◽  
Order Of Magnitude

ABSTRACTWe study theoretically and experimentally the effects of the Coulomb and the spin-orbit coupling on the electronic structure of small quantum dots. A tight-binding calculation with restricted configuration interaction is developed in a typical case: very small cubic quantum dots for which the electron-hole exchange interaction is of the order of magnitude of the spinorbit interaction. Experimentally, resonant photoluminescence and photoluminescence excitation are used to obtain information on a single size of CdS quantum dot obtained by a chemical growth method.

scholarly journals The role of the electron-hole exchange in the spin mixing of excited-shell excitons in quantum dots

2010 ◽  
Author(s):  
Ş. C. Bădescu ◽  
T. L. Reinecke ◽  
Marília Caldas ◽  
Nelson Studart
Keyword(s):  
Quantum Dots ◽  
Electron Hole

Mechanisms for intraband energy relaxation in semiconductor quantum dots: The role of electron-hole interactions

2000 ◽  
Vol 61 (20) ◽  
pp. R13349-R13352 ◽  
Author(s):  
V. I. Klimov ◽  
A. A. Mikhailovsky ◽  
D. W. McBranch ◽  
C. A. Leatherdale ◽  
M. G. Bawendi
Keyword(s):  
Quantum Dots ◽  
Energy Relaxation ◽  
Semiconductor Quantum Dots ◽  
Electron Hole

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

The role of elevated autophagy on the synaptic plasticity impairment caused by CdSe/ZnS quantum dots

Biomaterials ◽  
2013 ◽  
Vol 34 (38) ◽  
pp. 10172-10181 ◽  
Author(s):  
Liang Chen ◽  
Yanyan Miao ◽  
Lin Chen ◽  
Peipei Jin ◽  
Yingying Zha ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Synaptic Plasticity

scholarly journals The Role of Sodium in Stabilizing Tin-Lead (Sn-Pb) Alloyed Perovskite Quantum Dots

2021 ◽  
Author(s):  
Junke Jiang ◽  
Feng Liu ◽  
Qing Shen ◽  
Shuxia Tao
Keyword(s):  
Quantum Dots ◽  
Phase Stability ◽  
Band Gaps ◽  
Great Promise ◽  
Narrow Bandgap ◽  
Perovskite Quantum Dots ◽  
Optoelectronic Applications

Narrow-bandgap CsSnxPb1-xI3 perovskite quantum dots (QDs) show great promise for optoelectronic applications owing to their reduced use of toxic Pb, improved phase stability, and tunable band gaps in the visible...

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