Electronic and optical responses of laser dressed triple concentric quantum rings in electric field

Bejan, D.; Radu, A.; Stan, Cristina

doi:10.1080/14786435.2023.2230461

Cited by 4 publications

(2 citation statements)

References 43 publications

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“…The quantum system we theoretically investigated is the GaAs/AlGaAs semiconductor DQR produced by droplet epitaxy, as presented in detail in [17][18][19][20][21]. Figure 1 illustrates the geometry of this axially symmetrical nanostructure, which was recreated based on the original article by Kuroda et al [17].…”

Section: Theorymentioning

confidence: 99%

“…The immediate implication is that, unlike the case of simplified structures addressed by many theoretical analyses (spheres, cylinders, cones, disks, etc), the theoretical predictions and the numerical results obtained in this work are more likely to be tested experimentally. Recently, we have also published a theoretical study on a realistic triple QR [18]. In the present article we propose to estimate the extent to which the strength and energy of the interband transitions can be modified by the interaction of a DQR with two types of fields: a static EF and an intense laser field (LF) non-resonant with transitions specific to the structure.…”

Section: Introductionmentioning

confidence: 99%

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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: Theorymentioning

confidence: 99%

Section: Introductionmentioning

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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Controlling the interband transitions in a triple quantum ring: Effects of intense laser and electric fields

Bejan,

Stan

2024

Journal of Physics and Chemistry of Solids

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Geometry-Tuned Optical Absorption Spectra of the Coupled Quantum Dot–Double Quantum Ring Structure

Bejan,

Stan

2024

Nanomaterials

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We investigate the energy spectra and optical absorption of a 3D quantum dot–double quantum ring structure of GaAs/Al0.3Ga0.7As with adjustable geometrical parameters. In the effective mass approximation, we perform 3D numerical computations using as height profile a superposition of three Gaussian functions. Independent variations of height and width of the dot and of the rings and also of the dot–rings distance determine particular responses, useful in practical applications. We consider that a suitable manipulation of the geometrical parameters of this type of quantum coupling offer a variety of responses and, more important, the possibility of a fine adjusting in energy spectra and in the opportunity of choosing definite absorption domains, properties required for the improvement of the performances of optoelectronic devices.

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Electronic and optical responses of laser dressed triple concentric quantum rings in electric field

Cited by 4 publications

References 43 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

Controlling the interband transitions in a triple quantum ring: Effects of intense laser and electric fields

Geometry-Tuned Optical Absorption Spectra of the Coupled Quantum Dot–Double Quantum Ring Structure

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