Electron-hole complexes in individual semimagnetic quantum dots

2005 ◽  
Vol 202 (14) ◽  
pp. 2609-2613 ◽  
Author(s):  
P. S. Dorozhkin ◽  
A. S. Brichkin ◽  
V. D. Kulakovskii ◽  
A. V. Chernenko ◽  
S. V. Zaitsev ◽  
...  
Keyword(s):  
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.

scholarly journals Electron-Hole Crossover in Graphene Quantum Dots

2009 ◽  
Vol 103 (4) ◽  
Author(s):  
J. Güttinger ◽  
C. Stampfer ◽  
F. Libisch ◽  
T. Frey ◽  
J. Burgdörfer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Electron Hole

Two time scales of the electron–hole spin relaxation in InAs/GaAs quantum dots

2006 ◽  
Vol 243 (15) ◽  
pp. 3928-3931
Author(s):  
C. Testelin ◽  
E. Aubry ◽  
M. Chaouache ◽  
M. Maaref ◽  
F. Bernardot ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Time Scales ◽  
Spin Relaxation ◽  
Electron Hole

Hole-hole and electron-hole exchange interactions in single InAs/GaAs quantum dots

2009 ◽  
Vol 79 (12) ◽  
Author(s):  
T. Warming ◽  
E. Siebert ◽  
A. Schliwa ◽  
E. Stock ◽  
R. Zimmermann ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Exchange Interactions ◽  
Electron Hole

Homogeneous linewidth of confined electron-hole-pair states in II-VI quantum dots

1993 ◽  
Vol 47 (7) ◽  
pp. 3684-3689 ◽  
Author(s):  
U. Woggon ◽  
S. Gaponenko ◽  
W. Langbein ◽  
A. Uhrig ◽  
C. Klingshirn
Keyword(s):  
Quantum Dots ◽  
Hole Pair ◽  
Electron Hole ◽  
Electron Hole Pair ◽  
Homogeneous Linewidth

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.

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