Direct Interband Light Absorption in Conical Quantum Dot

Hayrapetyan, D. B.; Chalyan, Astghik; Kazaryan, É. M.; Sarkisyan, H. A.

doi:10.1155/2015/915742

Cited by 20 publications

(7 citation statements)

References 19 publications

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“…In the two-level system approach, the linear optical absorption coefficient of a quantum dot will be written in the following form 28,29 : Figure 4 shows the dependence of the linear absorption coefficient on the energy of the incident light for three different QD dept of potential. It can be seen that smaller QDs absorb light with higher energy than large QDs.…”

Section: Resultsmentioning

confidence: 99%

Intraband absorption of GaAs cylindrical quantum dot with Kratzer confinement potential in the presence of external electric and magnetic fields

Kharatyan

Hakobyan

2023

Quantum Optics and Photon Counting 2023

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Theoretical investigation of the intraband transition in a cylindrical quantum dot with the Kratzer confining potential is considered in the presence of external electric and magnetic fields. The intraband linear absorption spectra have been calculated for GaAs cylindrical quantum dots with different sizes. Moreover, the behavior of the linear absorption spectra is observed for various regimes of magnetic quantization and depending on the strength of the electric field. The density probability of the electro has been presented depending on the value of the external electric field. It has been shown that the shift of electron localization area is asymmetric depending on the external electric field direction.

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Section: Resultsmentioning

confidence: 99%

Intraband absorption of GaAs cylindrical quantum dot with Kratzer confinement potential in the presence of external electric and magnetic fields

Kharatyan

Hakobyan

2023

Quantum Optics and Photon Counting 2023

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“…On the other hand, more intricate structures like quantum rings 11 can be approximately examined by employing various confinement potentials. Furthermore, the geometrical adiabatic approximation 12 has been applied to theoretically explore strongly prolate and oblate lens-shaped, ellipsoidal, and conical QDs 13,14 . Nonetheless QDs with more trivial geometries, including conical QDs with similar base radius and height, present analytical challenges and are seldom explored theoretically 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence spectra in GaAs biconical quantum dots

Gavalajyan

2024

Nanophotonics X

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Quantum dots (QDs), renowned for their unique electronic and optical properties, are finding innovative applications in areas such as bioimaging, quantum computing, and light-emitting diodes. This study focuses on biconical (QD), which offer enhanced control over charge carrier confinement, leading to greater tunability of their electronic and optical properties. Utilizing numerical discretization within the effective-mass approximation, the research accurately calculates excitonic properties in these complex systems, particularly in GaAs biconical QDs. Additionally, the photoluminescence properties of these biconical QDs show promise as tunable light sources, with the added benefit of electric field influence for photoluminescence.The research also explores the energy dependence on bicone geometry, highlighting energy coincidence as the two cones' heights match. Photoluminescence investigations, conducted on biconical QDs of varying sizes under different electric field conditions, confirm the expected red and blue shifts based on the field direction.In conclusion, this study establishes a theoretical foundation for manipulating the properties of biconical QDs, opening avenues for their application in optoelectronic devices. The ability to control photoluminescence shifts through electric field direction underscores the practical significance of this research.

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“…In the next article 35 , the electronic states and optical properties of conical quantum dots (CQDs) made of GaAs are studied using the adiabatic approximation. The analytical dependence of energy levels on the geometrical parameters of the CQD is obtained.…”

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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Direct Interband Light Absorption in Conical Quantum Dot

Cited by 20 publications

References 19 publications

Intraband absorption of GaAs cylindrical quantum dot with Kratzer confinement potential in the presence of external electric and magnetic fields

Intraband absorption of GaAs cylindrical quantum dot with Kratzer confinement potential in the presence of external electric and magnetic fields

Photoluminescence spectra in GaAs biconical quantum dots

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

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