Multiexcited state study in InAs DWELL structures

Espínola, J.L. Casas; Torchynska, T. V.; Polupan, Georgiy; Velázquez-Lozada, Erick

doi:10.1016/j.mseb.2009.01.006

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…(4) where M is the mass of the oscillator; then, it is clear that the Debye temperature, as well as parameter A, defines the lattice separation and deformation potential due to oscillation. Large values of the fitting parameters, are attributed to In/Ga interdiffusion during growth [16]; the interdiffusion process is responsible for changing the lattice separation. Full understanding of the interdiffusion mechanism and its effect on the thermodynamical parameters are essential for device fabrication based on the InAs QD structure [17][18][19][20].…”

Section: Resultsmentioning

confidence: 99%

Analysis of In/Ga Inter-Diffusion Effect on the Thermodynamical Properties of InAs Quantum Dot

Abdellatif

Song

Lee

et al. 2016

Applied Science and Convergence Technology

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Debye temperature is an important thermodynamical factor in quantum dots (QDs); it can be used to determine the degree of homogeneity of a QD structure as well as to study the interdiffusion mechanism during growth. Direct estimation of the Debye temperature can be obtained using the Varshni relation. The Varshni relation is an empirical formula that can interpret the change of emission energy with temperature as a result of phonon interaction. On the other hand, phonons energy can be calculated using the Fan Expression. The Fan expression and Varshni relation are considered equivalent at a temperature higher than Debye temperature for InAs quantum dot. We investigated InAs quantum dot optically, the photoluminescence spectra and peak position dependency on temperature has been discussed. We applied a mathematical treatment using Fan expression, and the Varshni relation to obtain the Debye temperature and the phonon energy for InAs quantum dots sample. Debye temperature increase about double compared to bulk crystal. We concluded that the In/Ga interdiffusion during growth played a major role in altering the quantum dot thermodynamical parameters.

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Section: Resultsmentioning

confidence: 99%

Analysis of In/Ga Inter-Diffusion Effect on the Thermodynamical Properties of InAs Quantum Dot

Abdellatif

Song

Lee

et al. 2016

Applied Science and Convergence Technology

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“…Simultaneously the shift of GS PL peak to high energy in #5 with larger QD lateral sizes (Table 1) is the subsequence of essential compressive strain in this structure. Note that the compresive strain can stimulate the Ga/In inter-diffusion process in #1 and #5 that is accompained by the PL peak shift into high energy side as well (Fig.7) [63,64].…”

Section: Elastic Strain In Symmetric Inas Qd Structures With Differenmentioning

confidence: 91%

InAs Quantum Dots in Symmetric InGaAs/GaAs Quantum Wells

Torchynska¹

2012

Fingerprints in the Optical and Transport Properties of Quantum Dots

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“…The ASIA ISNCSCI scores 13 were used for assessing and classifying the neurological level and extent of SCI and were assessed at injury baseline and after 4, 8, 16, 26, and 52 weeks.…”

Section: Methodsmentioning

confidence: 99%

Routine Blood Chemistry Predicts Functional Recovery After Traumatic Spinal Cord Injury: A Post Hoc Analysis

Leister

Linde

et al. 2021

Neurorehabil Neural Repair

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Background Spinal cord injury (SCI) leads to various degrees of lifelong functional deficits. Most individuals with incomplete SCI experience a certain degree of functional recovery, especially within the first-year postinjury. However, this is difficult to predict, and surrogate biomarkers are urgently needed. Objective We aimed to (1) determine if routine blood chemistry parameters are related to neurological recovery after SCI, (2) evaluate if such parameters could predict functional recovery, and (3) establish cutoff values that could inform clinical decision-making. Methods We performed a post hoc analysis of routine blood chemistry parameters in patients with traumatic SCI (n = 676). Blood samples were collected between 24 and 72 hours as well as at 1, 2, 4, 8, and 52 weeks postinjury. Linear mixed models, regression analysis, and unbiased recursive partitioning (URP) of blood chemistry data were used to relate to and predict walking recovery 1 year postinjury. Results The temporal profile of platelet counts and serum levels of albumin, alkaline phosphatase, and creatinine differentiated patients who recovered walking from those who remained wheelchair bound. The 4 blood chemistry parameters from the sample collection 8 weeks postinjury predicted functional recovery observed 1 year after incomplete SCI. Finally, URP defined a cutoff for serum albumin at 3.7 g/dL, which in combination with baseline injury severity differentiates individuals who regain ambulation from those not able to walk. Specifically, about 80% of those with albumin >3.7 g/dL recovered walking. Conclusions Routine blood chemistry data from the postacute phase, together with baseline injury severity, predict functional outcome after incomplete SCI.

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Multiexcited state study in InAs DWELL structures

Cited by 8 publications

References 8 publications

Analysis of In/Ga Inter-Diffusion Effect on the Thermodynamical Properties of InAs Quantum Dot

Analysis of In/Ga Inter-Diffusion Effect on the Thermodynamical Properties of InAs Quantum Dot

InAs Quantum Dots in Symmetric InGaAs/GaAs Quantum Wells

Routine Blood Chemistry Predicts Functional Recovery After Traumatic Spinal Cord Injury: A Post Hoc Analysis

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