Low Magnetic Field Effect on the Polarisability of Excitons in Spherical Quantum Dots

Khamkhami, J. El; Feddi, E.; Assaid, E.; Dujardin, F.; Stébé, B.; Diouri, J.

doi:10.1238/physica.regular.064a00504

Cited by 15 publications

(10 citation statements)

References 20 publications

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“…We have shown that, in the framework of EMA, the exciton Hamiltonian is separated into two independent parts where the physics of the problem is described by the lateral confinement. The analysis of the exciton Stark shift shows that, for any electric field strength, the Stark shift has not only the quadratic dependence but its description requires a series of powers of F contrary to what happens in the case of spherical quantum dots [14,19]. The behavior of the optical integral shows that the exciton lifetime is greater than that without the electric field due to the field-induced polarization.…”

Section: Discussionmentioning

confidence: 95%

“…Some pioneering works [9][10][11][12][13][14][15][16] have paved the way for discovery of the performances related to the electric field effect in quantum wells, quantum wires and quantum dots and have proved that the electric field can provide useful information for potential applications of these low-dimensional systems. More recently the quantum-confined Stark effect (QCSE) has attracted much attention in QD structures and QD molecules [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the anomalous Stark effect in a thin disc-shaped quantum dot

Oukerroum

Feddi

Bailach

et al. 2010

J. Phys.: Condens. Matter

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The effect of a lateral external electric field F on an exciton ground state in an InAs disc-shaped quantum dot has been studied using a variational method within the effective mass approximation. We consider that the radial dimension of the disc is very large compared to its height. This situation leads to separating the excitonic Hamiltonian into two independent parts: the lateral confinement which corresponds to a two-dimensional harmonic oscillator and an infinite square well in the growth direction. Our calculations show that the complete description of the lateral Stark shift requires both the linear and quadratic terms in F which explains that the exciton possess nonzero lateral dipolar moment and polarizability. The fit of the calculated Stark shift permits us to estimate the lateral permanent dipole moment and the polarizability according to the disc size. Our results are compared to those existing in the literature. In addition the behavior of the optical integral shows that the exciton lifetime is greater than that under zero field which is due to the field-induced polarization.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

On the anomalous Stark effect in a thin disc-shaped quantum dot

Oukerroum

Feddi

Bailach

et al. 2010

J. Phys.: Condens. Matter

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“…In our previous study, we discussed the shortcomings of this model. Indeed, the model adopted by Ferreyra and Proetto gives results close to those from the model of a correlated pair confined in an infinitely deep potential only for the strong-confinement regime [17,18]. A fourth study was performed by Kai Chang [19].…”

Section: Introductionmentioning

confidence: 86%

“…The author claimed that this transition may be observed by investigating experimentally the intensity of the photoluminescence peak for different IQD structures. The most recent study was made by El Khamkhami et al [17,18]. These authors performed a variational determination of the exciton ground state energy in an IQD.…”

Section: Introductionmentioning

confidence: 99%

Excitons in InP/InAs inhomogeneous quantum dots

Assaid¹,

Feddi²,

Khamkhami³

et al. 2002

J. Phys.: Condens. Matter

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Wannier excitons confined in an InP/InAs inhomogeneous quantum dot (IQD) have been studied theoretically in the framework of the effective mass approximation. A finite-depth potential well has been used to describe the effect of the quantum confinement in the InAs layer. The exciton binding energy has been determined using the Ritz variational method. The spatial correlation between the electron and the hole has been taken into account in the expression for the wavefunction. It has been shown that for a fixed size b of the IQD, the exciton binding energy depends strongly on the core radius a. Moreover, it became apparent that there are two critical values of the core radius, acrit and a2D, for which important changes of the exciton binding occur. The former critical value, acrit, corresponds to a minimum of the exciton binding energy and may be used to distinguish between tridimensional confinement and bidimensional confinement. The latter critical value, a2D, corresponds to a maximum of the exciton binding energy and to the most pronounced bidimensional character of the exciton.

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“…During the past few decades, quantum dot-quantum well (QDQW) nanoparticles have attracted much interest due to their importance in physics, electronic and optical applications [1][2][3][4][5]. The so-called QDQW nanoparticles are typically the spherical core-shell three-layer heterostructures composed of two different materials, in which the material with the smaller bulk band gap is embedded between a core and an outer shell made of the larger band gap material.…”

Section: Introductionmentioning

confidence: 99%

Uncorrelated electron-hole transition Energy in GaN│InGaN│GaN Spherical QDQW Nanoparticles

Ghazi¹,

Jorio²,

Zorkani³

2013

Comm. in Phys.

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Abstract. The electron (hole) energy and uncorrelated 1Se − 1S h electron-hole transition in Core(GaN)| well(InxGa1−xN)| shell(GaN) spherical QDQW nanoparticles are investigated as a function of the inner and the outer radii. The calculations are performed within the framework of the effective-mass approximation and the finite parabolic potential confinement barrier in which two confined parameters are taking account. The Indium composition effect is also investigated. A critical value of the outer and the inner ratio is obtained which constitutes the turning point of two indium composition behaviors.

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Low Magnetic Field Effect on the Polarisability of Excitons in Spherical Quantum Dots

Cited by 15 publications

References 20 publications

On the anomalous Stark effect in a thin disc-shaped quantum dot

On the anomalous Stark effect in a thin disc-shaped quantum dot

Excitons in InP/InAs inhomogeneous quantum dots

Uncorrelated electron-hole transition Energy in GaN│InGaN│GaN Spherical QDQW Nanoparticles

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