Exciton binding energy in spherical quantum dots in a magnetic field

1999 ◽  
Vol 86 (8) ◽  
pp. 4509-4514 ◽  
Author(s):  
Zhigang Xiao
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Binding Energy ◽  
Exciton Binding Energy

The polaronic shift of exciton binding energy in quantum dots with a degenerate valence band

2002 ◽  
Vol 14 (48) ◽  
pp. 13357-13365 ◽  
Author(s):  
Arshak L Vartanian ◽  
Anna L Asatryan ◽  
Albert A Kirakosyan
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Valence Band ◽  
Exciton Binding Energy

LOCALIZED EXCITONS IN SELF-ASSEMBLED InxGa1-xN QUANTUM DOTS

2005 ◽  
Vol 19 (12) ◽  
pp. 589-598
Author(s):  
XIAN-QI DAI ◽  
FENG-ZHEN HUANG ◽  
JUN-JIE SHI
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Variational Approach ◽  
Structural Parameters ◽  
Exciton Binding Energy ◽  
Mass Approximation ◽  
Energy Maximum ◽  
Localized Excitons ◽  
The Relationship ◽  
Good Agreement

Within the framework of effective-mass approximation, the exciton states localized in cylindrical InGaN quantum dots (QDs) are investigated using a variational approach. The relationship between the exciton states and structural parameters of QDs with radius R and height L are studied in detail. The numerical results show that the exciton binding energy is sensitive to the ratio of R/L for a QD with a given volume. There is a maximum in the binding energy, where the electrons and holes are the most efficiently confined in the QDs with special structural parameters. The binding energy maximum can be obtained at about L = 1.7 nm for different QD volumes. The exciton binding energy and emission wavelength depend sensitively on structural parameters and the In content in the In x Ga 1-x N active layer. Our calculated emission wavelengths are in good agreement with experimental data.

Observation of confinement-dependent exciton binding energy of GaN quantum dots

1998 ◽  
Vol 73 (8) ◽  
pp. 1104-1106 ◽  
Author(s):  
Peter Ramvall ◽  
Satoru Tanaka ◽  
Shintaro Nomura ◽  
Philippe Riblet ◽  
Yoshinobu Aoyagi
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Exciton Binding Energy

THE EFFECT OF POSITION DEPENDENT EFFECTIVE MASS OF HYDROGENIC IMPURITIES IN PARABOLIC GaAs/GaAlAs QUANTUM DOTS IN A STRONG MAGNETIC FIELD

2009 ◽  
Vol 23 (26) ◽  
pp. 5109-5118 ◽  
Author(s):  
A. JOHN PETER
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Binding Energy ◽  
Effective Mass ◽  
Bound States ◽  
Mass Approximation ◽  
Infinite Case ◽  
Dependent Mass ◽  
The Magnetic Field ◽  
Peak Value

The binding energy of shallow hydrogenic impurities in parabolic GaAs/GaAlAs quantum dots is calculated as a function of dot radius in the influence of magnetic field. The binding energy has been calculated following a variational procedure within the effective-mass approximation. Calculations are presented with constant effective-mass and position dependent effective masses. A finite confining potential well with depth is determined by the discontinuity of the band gap in the quantum dot and the cladding. The results show that the impurity binding energy (i) increases as the dot radius decreases for the infinite case, (ii) reaches a peak value around 1R* as the dot radius decreases and then diminishes to a limiting value corresponding to the radius for which there are no bound states in the well for the infinite case, and (iii) increases with the magnetic field. Also it is found that (i) the use of constant effective mass (0.067 m0) is justified for dot sizes ≥ a* where a* is the effective Bohr radius which is about 100 Å for GaAs , in the estimation of ionization energy and (ii) the binding energy shows complicated behavior when the position dependent mass is included for the dot size ≤ a*. These results are compared with the available existing literatures.

Exciton binding energy in type II quantum dots

2007 ◽  
Vol 4 (2) ◽  
pp. 385-388 ◽  
Author(s):  
P. F. Gomes ◽  
M. P. F. Godoy ◽  
A. B. Veloso ◽  
M. K. K. Nakaema ◽  
F. Iikawa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Exciton Binding Energy ◽  
Type Ii

Exciton binding energy in a quantum wire in the presence of a magnetic field

1995 ◽  
Vol 77 (3) ◽  
pp. 1097-1104 ◽  
Author(s):  
Gang Li ◽  
Spiros V. Branis ◽  
K. K. Bajaj
Keyword(s):  
Magnetic Field ◽  
Binding Energy ◽  
Quantum Wire ◽  
Exciton Binding Energy
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