Nonlinear optical properties of lens-shaped core/shell quantum dots coupled with a wetting layer: effects of transverse electric field, pressure, and temperature

Choubani, M.; Maâref, H.; Saidi, F.

doi:10.1016/j.jpcs.2019.109226

Cited by 30 publications

(4 citation statements)

References 36 publications

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“…Where 𝑛 is the volume density of carriers in the system, 𝑀𝑖𝑗 = ⟨𝜓𝑖 |𝑧|𝜓𝑗 ⟩ is the DTMEs, 𝐸 𝑗𝑖 = 𝐸 𝑗 − 𝐸 𝑖 is the transition energy between the two quantum states, ℏ𝜔 denotes the incident photon energy, 𝐸 ̃ is the amplitude of the electromagnetic field, and Г = 1/𝜏 is the relaxation rate [44][45][46].…”

Section: Optical Susceptibility Absorption and Refractive Index Changesmentioning

confidence: 99%

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Hasanirokh

2023

Preprint

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In the present work, we have explored how the pressure, temperature and size of a GaAs quantum ring in the presence of Rashba and Dresselhaus spin–orbit couplings (SOC) can affect the energy states, dipole transition matrix elements (DTMEs), optical absorption coefficients (OACs) and refractive index changes (RICs). In addition to the theoretical beauty of this important and exciting area of research, it represents the attractive potential applications in the growth of optoelectronics devices. The results have indicated that the ground state energy values rise with pressure and Dresselhaus coupling. Meanwhile, increasing the temperature and Rashba coupling as well as the ring’s size leads to a decrement of energy levels. Taking the transition from the ground state to the first excited state, we have found that the temperature, pressure, inner and outer radius decrease DTMEs because of a drop in wave functions overlap. Therefore, the presence of SOCs, pressure, temperature and dimensions of the quantum ring dominate the electronic behavior and consequently control the absorption as well as the refractive index of the nano structure. A significant enhancement of the OACs and RICs curves is witnessed when the pressure, ring geometric, and Rashba strength are enlarged, but Increasing Dresselhaus coefficient decreases OACs and RICs. These parameters are responsible for blue shifts in the optical absorption. These results can be suitable in the construction of spin-based devices.

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Section: Optical Susceptibility Absorption and Refractive Index Changesmentioning

confidence: 99%

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Hasanirokh

2023

Preprint

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“…And the finite element method (FEM) can serve as a good "value for money" method, requiring moderate computational resources and giving reasonably accurate results for the eigenvalues and eigenvectors for the electron and hole wavefunctions in the QD. Various articles have used the FEM for modelling of QDs [47][48][49][50][51] . In the following article the authors used FEM to obtain the probability densities and energy levels of various GaAs structures, including rectangular, spherical, cylindrical, ellipsoidal, spheroidal, and conical QDs, as well as quantum rings, nanotadpoles, and nanostars.…”

Section: Introductionmentioning

confidence: 99%

The contribution of edge number on the optical properties in ZnO pyramidal quantum dots

Mantashyan

2023

Quantum Optics and Photon Counting 2023

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Considerable advances in the growth process of quantum dots with non-trivial geometries have been obtained. These advances lead to countless applications in quantum optics, quantum information, and biophysics. However, the theoretical investigation of these objects is complex and analytically impossible in most cases. The investigation of pyramidal or conical quantum dots with a comparable height-to-base ratio is one of those problems. That is why the numerical finite element method in the framework of the envelope function approximation has been used to obtain the eigenvalues and eigenfunctions for ZnO pyramidal and conical quantum dots. The mesh domains required for the finite element method calculation were pyramidal domains with bases ranging from an equilateral triangle to an equilateral decagon. Cones were used for the approximation of the mesh objects for pyramidal quantum dots with a larger number of edges. Different head radius to height ratios (½, 1, 2, 3, 4) were considered. The optical transition energies were shown to decrease with the increase in the number of faces. The optical transition strengths were shown to exhibit the opposite behavior. The interband absorption curves generally exhibit a redshift with the increase in the number of edges.

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“…A nivel teórico las investigaciones se han centrado en diseñar, entender y controlar propiedades estructurales, ópticas y electrónicas en los diferentes tipos de sistemas nanoestructurados. Por ejemplo, en sistemas que incluyen puntos cuánticos en presencia de agentes externos tales como campos eléctricos [6] o magnéticos [7] han sido estudiados por sus diversas aplicaciones.…”

Section: Introductionunclassified

Efectos del bombeo incoherente de excitones en la susceptibilidad óptica lineal de una nanoestructura esférica

2022

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Se estudian los efectos del bombeo incoherente de excitones sobre una nanoestructura semicondutora con geometría esférica que interactua con luz monocromática. Se consideraron los procesos disipativos pér- dida por emisión espontánea y pérdida de fase coherente mediante el formalismo de sistemas cuánticos abiertos, usando una ecuación maestra con términos de Lindblad, donde también se incluye el bombeo incoherente. Se usó la técnica de la expansión perturbativa sobre el operador densidad aplicado sobre el operador de polarización. Se obtuvo una expresión de la susceptibilidad óptica lineal en una nanoestruc- tura que incluye el bombeo incoherente. Además se encontró que el bombeo incoherente de excitones no afecta la separación energética de los niveles del sistema cuántico.

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Nonlinear optical properties of lens-shaped core/shell quantum dots coupled with a wetting layer: effects of transverse electric field, pressure, and temperature

Cited by 30 publications

References 36 publications

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

The contribution of edge number on the optical properties in ZnO pyramidal quantum dots

Efectos del bombeo incoherente de excitones en la susceptibilidad óptica lineal de una nanoestructura esférica

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