Transverse laser dressing effects on the subband density of states in a 20-nm-wide GaAs/Al0.3Ga0.7As quantum well wire

Radu, A.

doi:10.1016/j.physe.2012.03.009

Cited by 10 publications

(4 citation statements)

References 63 publications

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“…At small values of the laser parameter (α e ⩽ 5 nm, i.e. below the typical axial size of the structure), the overlap is somewhat better in the case of axial polarization, because a moderate axial dressing tends to effectively colocalize the particles in the ground states [39]. This explanation is related to another effect known from the laser dressing of 1D structures, namely, the reduction of the effective confinement width of low-energy states in quantum wells.…”

Section: Resultsmentioning

confidence: 99%

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Radu,

Stan,

Bejan

2023

New J. Phys.

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In this work, the changes in the energy of electrons and holes, oscillator strength and interband transition time when external fields are applied to a GaAs/AlGaAs semiconductor double ring grown by the droplet epitaxy technique are theoretically analyzed. We consider a static electric field and an intense laser field nonresonant with the quantum structure, with variable intensities and orientations with respect to the symmetry axis of the quantum ring (QR). In the formalism of the effective mass approximation for electrons and holes, the energies and wavefunctions were numerically computed using the finite element method implemented with an accurate three-dimensional model of the real QR. Laser dressing of the confining potential was performed using the exact integration formula at each point. Our results show major differences between the effects of the two types of applied fields, caused mainly by the static electric-field-induced strong polarizability of the confined electron-hole pair. In addition, the effects of both fields exhibit strong anisotropy in the electronic properties as a result of the particular flattened geometry of the QR. Proper combinations of field strengths and orientations are helpful in designing accurate tools for the sensitive manipulation of interband radiative properties.

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Section: Resultsmentioning

confidence: 99%

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Radu,

Stan,

Bejan

2023

New J. Phys.

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“…Beyond the theoretical interest, solving a 2D confinement problem can be useful in practice, mainly for quantum wires [37,38], highly oblate or flat 3D quantum dots [39,40], and 2D quantum dots [41,42]. In the first case, quantum confinement occurs along the transverse directions of the wire, which is where the 2D character of the SE comes from [43]. The 2D SE energy solutions under the effective mass approximation give the subband edges in the quantum wires.…”

Section: Introductionmentioning

confidence: 99%

Deep learning neural network for approaching Schrödinger problems with arbitrary two-dimensional confinement

Radu,

Duque

2023

Mach. Learn.: Sci. Technol.

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This article presents an approach to the two-dimensional Schrödinger equation based on automatic learning methods with neural networks. It is intended to determine the ground state of a particle confined in any two-dimensional potential, starting from the knowledge of the solutions to a large number of arbitrary sample problems. A network architecture with two hidden layers is proposed to predict the wave function and energy of the ground state. Several accuracy indicators are proposed for validating the estimates provided by the neural network. The testing of the trained network is done by applying it to a large set of confinement potentials different from those used in the learning process. Some particular cases with symmetrical potentials are solved as concrete examples, and a good network prediction accuracy is found.

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“…e authors of [30][31][32][33] obtained analytical solutions of the Schrödinger equation for cylindrical quantum wires with a finite potential and a parabolic dispersion law. e solution of the Schrödinger equation is obtained by the finite difference method (shooting method) for rectangular [34] and cylindrical [35,36] quantum wires.…”

Section: Introductionmentioning

confidence: 99%

Energy Levels in Nanowires and Nanorods with a Finite Potential Well

Gulyamov

Davlatov

et al. 2020

Advances in Condensed Matter Physics

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The energy of electrons and holes in cylindrical quantum wires with a finite potential well was calculated by two methods. An analytical expression is approximately determined that allows one to calculate the energy of electrons and holes at the first discrete level in a cylindrical quantum wire. The electron energy was calculated by two methods for cylindrical layers of different radius. In the calculations, the nonparabolicity of the electron energy spectrum is taken into account. The dependence of the effective masses of electrons and holes on the radius of a quantum wires is determined. An analysis is made of the dependence of the energy of electrons and holes on the internal and external radii, and it is determined that the energy of electrons and holes in cylindrical layers with a constant thickness weakly depends on the internal radius. The results were obtained for the InP/InAs heterostructures.

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Transverse laser dressing effects on the subband density of states in a 20-nm-wide GaAs/Al0.3Ga0.7As quantum well wire

Cited by 10 publications

References 63 publications

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Finite element 3D model of a double quantum ring: effects of electric and laser fields on the interband transition

Deep learning neural network for approaching Schrödinger problems with arbitrary two-dimensional confinement

Energy Levels in Nanowires and Nanorods with a Finite Potential Well

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