Optical Properties of a Quantum Dot-Ring System Grown Using Droplet Epitaxy

Linares-García, Gabriel; Meza-Montes, L.; Stinaff, Eric; Alsolamy, Sami; Ware, Morgan E.; Mazur, Yuriy I.; Wang, Z. M.; Lee, Jihoon; Salamo, Gregory J.

doi:10.1186/s11671-016-1518-2

Cited by 25 publications

(11 citation statements)

References 27 publications

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“…The magnetic field present a feasible way to modify the confinement energy and the probability density of the carriers in zinc-blende systems, which could be used in applications as quantum computing. The effect of the impurities is also important because it could explain some shifts in the photoluminescence spectrum in the quantum dots [25,[34][35][36].…”

Section: Discussionmentioning

confidence: 99%

Effect of magnetic field and impurities in InAs/GaAs and GaN/AlN self-assembled quantum dots

Garcia

Meza-Montes

2019

Rev. Mex. Fís.

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A theoeritical study on the effect of a magnetic field or impurities on the carries states of self-assembled quantum dots is presented. The magnetic field is applied along the growth direction of the dots, and for comparison two systems are considered, InAs embeded in GaAs, and GaN in AlN. The electronic states and energy are calculated in the framework of the k.p theory in 8 bands including the strain and piezoelectric effects. Zeeman splitting and anticrossings are observed in InAs/GaAs, while the field introduces small changes in the nitrides. It is also included a study about hidrogen-like impurities, which may be negative or positive. It is noted that depending on the type of impurity, the confinement energy of carriers is changed, and the distribution of the probability density of the carriers is affected too.

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Section: Discussionmentioning

confidence: 99%

Effect of magnetic field and impurities in InAs/GaAs and GaN/AlN self-assembled quantum dots

Garcia

Meza-Montes

2019

Rev. Mex. Fís.

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“…The intraband optical absorption in QRs has attracted an enormous interest in recent years [18][19][20] because of large optical nonlinearity observed in these structures and potential applications in photodetectors and highspeed electro-optical devices [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Interminiband absorption in a quantum ring superlattice in magnetic field with periodic vector potential

Aziz-Aghchegala

Mughnetsyan

Atayan

et al. 2020

Physica E: Low-dimensional Systems and Nanostructures

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The miniband Aharonov-Bohm oscillations and the interminiband absorption coefficient have been considered theoretically for one-layer superlattices of square and rectangular symmetries, composed of cylindrical quantum rings in the external transverse magnetic field with a periodic vector potential by the lattice constants. The crossings and anticrossings of the energies corresponding to different values of quasimomentum are observed. It is shown that the energy gap between the minibands and the sequence of the energies in each miniband can be tuned by the magnetic field. The interminiband absorption coefficient qualitatively depends on the symmetry of the superlattice, magnetic field induction and the incident light polarization. The obtained results indicate on the possibility to control the electronic and optical characteristics of the devices based on quantum ring superlattices.

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“…For instance, the deviations from the ideal toric-shape can be observed from AFM images of QRs obtained via droplet epitaxy 19,20 . Using the same growth technique (that allows varying the ring geometry), Kuroda et al .…”

Section: Introductionmentioning

confidence: 99%

Effects of Geometry on the Electronic Properties of Semiconductor Elliptical Quantum Rings

Vinasco

Radu

Kasapoğlu

et al. 2018

Sci Rep

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The electronic states in GaAs-AlxGa1−xAs elliptically-shaped quantum rings are theoretically investigated through the numerical solution of the effective mass band equation via the finite element method. The results are obtained for different sizes and geometries, including the possibility of a number of hill-shaped deformations that play the role of either connected or isolated quantum dots (hills), depending on the configuration chosen. The quantum ring transversal section is assumed to exhibit three different geometrical symmetries - squared, triangular and parabolic. The behavior of the allowed confined states as functions of the cross-section shape, the ring dimensions, and the number of hills-like structures are discussed in detail. The effective energy bandgap (photoluminescence peak with electron-hole correlation) is reported as well, as a function of the Al molar fraction.

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Optical Properties of a Quantum Dot-Ring System Grown Using Droplet Epitaxy

Cited by 25 publications

References 27 publications

Effect of magnetic field and impurities in InAs/GaAs and GaN/AlN self-assembled quantum dots

Effect of magnetic field and impurities in InAs/GaAs and GaN/AlN self-assembled quantum dots

Interminiband absorption in a quantum ring superlattice in magnetic field with periodic vector potential

Effects of Geometry on the Electronic Properties of Semiconductor Elliptical Quantum Rings

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