Excitons in Quantum Dots

Woggon, U.; Гапоненко, С. В.

doi:10.1002/pssb.2221890202

Cited by 126 publications

(57 citation statements)

References 224 publications

(101 reference statements)

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“…The confinement of quasi-particles in a dot increases the binding energy and the oscillator strength per unit volume of excitons and thus leads to an enhancement of excitonic effects [1] to [3]. Much effort has been devoted to the calculation of excitonic binding energies and oscillator strengths.…”

Section: Introductionmentioning

confidence: 99%

Density Matrix Approach to Electromagnetic Wave Scattering of a Quantum Dot

Silvestri¹,

Czajkowski

Bassani³

1999

phys. stat. sol. (a)

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We show how to compute the scattering of a plane electromagnetic wave on a quantum dot in the region of the excitonic resonances. The method uses the macroscopic Stahl's density matrix approach to compute the electromagnetic fields within and outside the quantum dot and takes into account the coherence between carriers and the electromagnetic waves. Numerical results are obtained for the case of GaAs/Ga1—xAlxAs quantum dots and effects due to coherence and to the size of the dots are found.

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Section: Introductionmentioning

confidence: 99%

Density Matrix Approach to Electromagnetic Wave Scattering of a Quantum Dot

Silvestri¹,

Czajkowski

Bassani³

1999

phys. stat. sol. (a)

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“…Optical properties of these species are determined by quantum confinement effects on the energy and probability of optical transitions [73], [74]. Typically, quantum yields of quantum dot luminescence do not exceed a few percent, and decay kinetics are strongly nonexponential due to a number of nonradiative relaxation processes.…”

Section: Nanocrystals Embedded In Opalsmentioning

confidence: 99%

Spontaneous emission of dye molecules, semiconductor nanocrystals, and rare-earth ions in opal-based photonic crystals

Гапоненко

Bogomolov

Petrov

et al. 1999

J. Lightwave Technol.

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Abstract-Photonic crystals based on silica colloidal crystals (artificial opals) exhibit pronounced stopbands for electromagnetic wave propagation and the corresponding modification of the photon density of states in the visible range. These spectrally selective features can be enhanced by impregnating opals with higher refractive materials like, e.g., polymers. Doping of these structures with dye molecules, semiconductor nanoparticles (quantum dots), and rare-earth ions provides a possibility to examine the challenging theoretical predictions of the inhibited spontaneous emission in photonic bandgap (PBG) materials. First experiments are discussed in which pronounced modification of spontaneous emission spectra and noticeable changes in decay kinetics were observed.

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“…Much work has been devoted to the study of hydrogenic impurity states in these systems [6 -33]. Binding energy calculations for hydrogenic impurities in quantum wells (QWs) [6 -8], quantum well wires (QWWs) [9][10][11][12][13][14][15][16][17][18][19][20][21] and quantum dots (QDs) [22][23][24] have been performed. It is found that when the dimensions of the system are reduced, the quantum size becomes clear and the effective strength of the coulomb interaction increases.…”

Section: Introductionmentioning

confidence: 99%

Electric field effect on the binding energy of a non‐hydrogenic donor impurity in a cylindrical cross‐sectional quantum well wire

Ulas

Cicek

Dalgic

2004

Physica Status Solidi (b)

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The effect of an electric field on the non-hydrogenic binding energy of a shallow donor impurity in a cylindrical cross-sectional GaAs-(Ga,Al)As quantum well wire (QWW) was investigated. Within the effective mass approximation, the non-hydrogenic binding energy of the donor impurity was calculated by a variational method as a function of the wire radius, donor impurity position and applied electric field. The results show that the non-hydrogenic binding energy of the donor impurity located around the centre is larger than that of the hydrogenic binding energy. The difference in binding energy of an on-centre shallow donor impurity in the two regimes increases more rapidly with decreasing QWW radius than for other impurity positions. It has been found that the sensitivity of the donor binding energies to the applied electric field in both regimes is almost the same.

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Excitons in Quantum Dots

Cited by 126 publications

References 224 publications

Density Matrix Approach to Electromagnetic Wave Scattering of a Quantum Dot

Density Matrix Approach to Electromagnetic Wave Scattering of a Quantum Dot

Spontaneous emission of dye molecules, semiconductor nanocrystals, and rare-earth ions in opal-based photonic crystals

Electric field effect on the binding energy of a non‐hydrogenic donor impurity in a cylindrical cross‐sectional quantum well wire

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