Výsledky vyhledávání - "L. M. R. Scolfaro"

Luminescence studies on nitride quaternary alloys double quantum wells

Autor: Guilherme Matos Sipahi, L. M. R. Scolfaro, O. F. P. dos Santos, E. F. da Silva, Sara C. P. Rodrigues

Publikováno v: Applied Surface Science. 254:7790-7793

We present theoretical photoluminescence (PL) spectra of undoped and p-doped AlxIn1−x−yGayN/AlXIn1−X−YGaYN double quantum wells (DQWs). The calculations were performed within the k.p method by means of solving a full eight-band Kane Hamiltoni

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::116d65f29ca88102709c0d1fd4fcec32
https://doi.org/10.1016/j.apsusc.2008.02.034

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Pressure‐induced phase transitions and polytypic structures in III‐Nitrides

Autor: C. Silva, H. W. Leite Alves, J. R. Leite, L. M. R. Scolfaro

Publikováno v: physica status solidi (c). 2:2468-2471

In this work, we have calculated ab initio the equation of state for the rocksalt, zincblende, wurtzite, 4H and 6H hexagonal modifications of GaN and InN, as well as both the wurtzite-to-rocksalt and zincblende-to-rocksalt phase transitions in these

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::35395508cf60daacc2d599947cd6c097
https://doi.org/10.1002/pssc.200461381

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Ab initio studies of indium separated phases in AlGaInN quaternary alloys

Autor: L. M. R. Scolfaro, J. R. Leite, M. Marques, Lara K. Teles, L. G. Ferreira

Publikováno v: physica status solidi (c). 2:2508-2511

In this work, ab initio total energy electronic structure calculations are combined with Monte Carlo simulations to study microscopically the indium separated phases taking place in AlxGayIn1–x–yN quaternary alloys. The presence of aluminum in th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5d66d8b16b569d4377e1f2c155a204d8
https://doi.org/10.1002/pssc.200461516

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Cubic binary compounds MnN and MnAs and diluted magnetic semiconductor alloys: a first-principle study

Autor: J. L. A. Alves, L. M. R. Scolfaro, R. A. Nogueira, J. R. Leite, R. de Paiva

Publikováno v: Journal of Magnetism and Magnetic Materials. 288:384-396

In this work we report ab initio calculations of the electronic structures of the binary compounds MnN and MnAs, and of the diluted magnetic semiconductor alloys Ga 1 - x Mn x N ( x = 0.06 ; 0.03) in the zinc-blende phase. We use the theoretical loca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f138edcaf09d8bad6ea241d1b37e8c18
https://doi.org/10.1016/j.jmmm.2004.09.124

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Controlling the Charge and the Spin Polarization Distributions in (In,Ga,Mn)As-Based Diluted Magnetic Semiconductor Multilayered Structures

Autor: Guilherme Matos Sipahi, L. M. R. Scolfaro, I. C. da Cunha Lima, J. R. Leite, S. C. P. Rodrigues

Publikováno v: Journal of Superconductivity. 18:61-67

A self-consistent Luttinger–Kohn (LK) calculation is used to obtain the electronic structure of Mn-doped semiconductor multilayers. In the particular, case of a (In,Ga)As/GaAs heterostructure, the ternary alloy has a smaller gap than GaAs, and intr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::41b91b8f0f7c10cf425cff7fb874b625
https://doi.org/10.1007/s10948-005-2151-y

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First principles studies of relativistic and spin-orbit effects on the HfO2 band structures

Autor: L. M. R. Scolfaro, A. T. Lino, Joelson Cott Garcia, G. A. Farias, Valder N. Freire, J. R. Leite, E. F. da Silva

Publikováno v: physica status solidi (c). 1:S236-S240

Electronic band and structural properties of the cubic, tetragonal, and monoclinic phases of HfO2 are calculated. The all electron ab initio self-consistent linear augmented plane-wave method within the framework of the local-density approximation wa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dc2094500c14336676b4f0beb110e4f8
https://doi.org/10.1002/pssc.200405147

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Phase separation and ordering in group-III nitride alloys

Autor: J. R. Leite, L. M. R. Scolfaro, M. Marques, Lara K. Teles, L. G. Ferreira

Publikováno v: Brazilian Journal of Physics v.34 n.2b 2004
Brazilian Journal of Physics
Sociedade Brasileira de Física (SBF)
instacron:SBF
Brazilian Journal of Physics, Volume: 34, Issue: 2b, Pages: 593-597, Published: JUN 2004

The electronic, structural, and thermodynamic properties of cubic (zinc blende) group-III nitride ternary In xGa1-xN and quaternary Al xIn yGa1-x-yN alloys are investigated by combining first-principles total energy calculations and cluster expansion

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20f1fc4fde14e504a58aecf1659a8262
https://doi.org/10.1590/s0103-97332004000400014

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The absorption coefficient of low dimensional semiconductor systems: the photoluminescence of InGaN quantum dot

Autor: L. M. R. Scolfaro, J. R. Leite, F. García-Moliner, H. Rodríguez-Coppola, Joaquín Tutor-Sánchez

Publikováno v: Microelectronics Journal. 35:103-110

The free carrier absorption coefficient of a low dimensional semiconductor system is formulated, with inclusion of interparticle Coulomb interaction, perturbatively, considering the bubble diagrams summed up to infinite order, which accounts for the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c31651bfe779e71b6688a59734973f81
https://doi.org/10.1016/j.mejo.2003.10.005

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Phase separation, effects of biaxial strain, and ordered phase formations in cubic nitride alloys

Autor: L. G. Ferreira, Lara K. Teles, L. M. R. Scolfaro, M. Marques, J. R. Leite

Publikováno v: Microelectronics Journal. 35:53-57

The thermodynamics as well as the energetics and the structural properties of cubic group-III nitrides alloys have been investigated by combining first-principles total energy calculations and cluster expansion methods. In particular results are show

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e9fee7fab3ecf8089191d4191a7b68b8
https://doi.org/10.1016/s0026-2692(03)00218-0

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Energy gap and optical properties of InxGa1xN

Autor: V. Yu. Davydov, Friedhelm Bechstedt, Mohamed Ferhat, Rüdiger Goldhahn, Oliver Ambacher, Jürgen Furthmüller, L. M. R. Scolfaro, Lara K. Teles, J. R. Leite

Publikováno v: physica status solidi (a). 195:628-633

We present ab initio calculations of the electronic structure and the optical properties of In x Ga 1-x N. They are completed by studies of the strain influence on the alloys. The results are critically discussed in the light of recent experiments. W

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7748dd56c0d55e92625b07845bc0348d
https://doi.org/10.1002/pssa.200306164

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