Terahertz emission in ladder plus Y-configurations in double quantum dot structure

Abdullah, M.; Noori, Farah T. Mohammed; Al-Khursan, Amin H.

doi:10.1364/ao.54.005186

Cited by 27 publications

(8 citation statements)

References 21 publications

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“…Ladder-plus-Y DQD structure, see Figure 1, contains |0>,|1>,|2>,|3>, and |4> subbands, as in previous works, 24–26 with transitions can be classified into two subsystems. The first subsystem contains |0>, |1>,|2>,|3>, and |4> subbands, with the |0>→ |1> transition (∑ w 01 energy); besides |1>→|2> transition (∑ w 12 energy),|1>→|3>, transition (∑ w 13 energy), finally the |3>→|4> transition (∑ w 34 energy).…”

Section: Ladder Plus Y-type In Dqd Systemmentioning

confidence: 87%

“…, and |4 . subbands, as in previous works, [24][25][26] with transitions can be classified into two subsystems. The first subsystem contains |0 .…”

Section: Ladder Plus Y-type In Dqd Systemmentioning

confidence: 97%

“…Taking WL state into account gives a ladder-plus-Y DQD structure. [24][25][26] In this work, SGC in ladder-plus-Y DQD system was studied where QD inhomogeneity and WL state were considered in the calculations. These two points are not included earlier in the study of SGC in QDs.…”

Section: Introductionmentioning

confidence: 99%

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Spontaneously generated coherence in ladder-plus-Y double quantum dot system

Al-Nashy

Jasim

Al-Shatravi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part N:

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A model was presented for linear susceptibility in ladder-plus-Y configuration of double quantum dot system using density matrix theory and including spontaneously generated coherence of Λ-type system. Wetting layer and quantum dot inhomogeneity were considered in the calculations, which gives a practical description of double quantum dot structures well. With increasing spontaneously generated coherence from Λ-component, the dispersion was increased and shifted under spontaneously generated coherence. The inclusion of wetting layer under spontaneously generated coherence increases gain which coincides with the published results. A possibility of slow light was predicted.

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Section: Ladder Plus Y-type In Dqd Systemmentioning

confidence: 87%

“…, and |4 . subbands, as in previous works, [24][25][26] with transitions can be classified into two subsystems. The first subsystem contains |0 .…”

Section: Ladder Plus Y-type In Dqd Systemmentioning

confidence: 97%

See 1 more Smart Citation

Spontaneously generated coherence in ladder-plus-Y double quantum dot system

Al-Nashy

Jasim

Al-Shatravi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part N:

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“…AMJ13 cell lines that were treated with PEG-PEI-SWCNTs exhibited morphological alterations. Figure 7(c) demonstrates decreased cytotoxicity owing to the decreased presence of cell colonies treated with PEG-PEI-SWCNTs, due to increased cytotoxicity [29,30]. Structural changes, lack of communication with neighboring cells, and decreased number as concentration increases reflect a synergistic effect at higher doses, resulting in a greater impact than the lower dose [29].…”

Section: Antiproliferative Activity Of Peg-pei-swcnts On Breastmentioning

confidence: 99%

Antiproliferative Activity of PEG-PEI-SWCNTs against AMJ13 Breast Cancer Cells

Jwameer

Salman

Noori

et al. 2023

Journal of Nanomaterials

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Single-walled carbon nanotubes (SWCNTs) involving polyethylene glycol (PEG) and polyethyleneimine (PEI), which contain amines, were produced and analyzed using X-ray diffraction (XRD), UV–vis spectroscopy, Raman spectroscopy (RS), and transmission electron microscopy (TEM) for the spectral and structural analyses of PEG-PEI-SWCNTs. PEG-PEI-SWCNTs demonstrated peaks using UV–vis spectroscopy at 300.98 nm, have a broad peak at 2θ = 23.51, linked to 002 with d-spacing (3.7816), and have crystalline sizes of 8.48 nm. In PEG-PEI-SWCNTs, TEM images demonstrated the accumulation of SWCNTs with PEG-PEI due to an increased main grain size with functionalization to 80.68 nm. The D and G bands in PEG-PEI-SWCNTs moved to 1,292 and 1,586 cm−1, respectively. SWCNTs are observed as a bundle of inhomogeneous, long-curved accumulates containing multitudes of tubes. The PEG-PEI-SWCNTs have a tubular structure that demonstrates particles scattered alongside the carbon nanotube sidewalls, which indicate that PEG and PEI are conjugated to the SWCNTs. Cytotoxicity evaluation of PEG-PEI-SWCNTs (6.25–100 µg/mL) in the breast cancer AMJ13 cell line was conducted for 24 and 72 hr, and the results showed enhanced toxicity to the tumor cells and decreased cytotoxicity against rhabdomyosarcoma (RD) normal cells.

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“…After the development of the growing technology of nanostructured QDs at different sizes and shapes, double QD (DQD) is proposing for improving the QD linear and nonlinear response due to the flexibility in manipulating between states, and a DQD Y-configuration system is presented in this sense [6][7][8]. After that, a ladder-plus-Y DQD system by considering a wetting layer (WL) with an orthogonalized plane wave (OPW) between QD states and WL is considering to simulate the real work of QD structure where OPW cannot be avoided [9]. The optical properties are improving by the DQD structure [10,11].…”

Section: Introductionmentioning

confidence: 99%

Recombination rates of the double quantum dot solar cell structure

Hadi

Al-Khursan

2021

Phys. Scr.

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This work proposes a double quantum dot structure as an intermediate-band layer to developing solar cell performance for the first time. The continuity-current equation is coupling with the density matrix equations, which are solved numerically to obtain the quantum efficiency. This modeling will calculate the momentum matrix elements of transitions, consider the orthogonalized plane wave for wetting layer- quantum dot transitions, and covers more characteristics than the rate equations by considering all the possible interactions between the states. The results simulate both the excitonic and nonexcitonic (electron-hole) cases. The work emphasizes adding the double quantum dot layer, which gives flexibility in choosing the energy difference between states controlling the recombination rates. The work refers to the importance of orthogonalized plane-wave in solar cell work. In both models, the band-band recombination is high for slight energy differences between the states, confirms the importance of the double quantum dot system to manipulate transitions between states and obtain higher rates. For the electron-hole model, the leakage is high due to the fast recombination of holes. The discrimination between occupations of states is increasing under the excitonic model due to growing hole occupation. In both models, reducing the quantum dot - quantum dot recombinations and increasing all other recombinations will increase the quantum efficiency. The high quantum dot band-to-band rate increases the quantum efficiency. In the excitonic model, lower rates than in the electron-hole model are enough for high quantum efficiency.

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Terahertz emission in ladder plus Y-configurations in double quantum dot structure

Cited by 27 publications

References 21 publications

Spontaneously generated coherence in ladder-plus-Y double quantum dot system

Spontaneously generated coherence in ladder-plus-Y double quantum dot system

Antiproliferative Activity of PEG-PEI-SWCNTs against AMJ13 Breast Cancer Cells

Recombination rates of the double quantum dot solar cell structure

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