RSS 1.0Artigos - Física - IGCE
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Characterization of a continuous phase transition in a chaotic system
Leonel, Edson D.
; Yoshida, Makoto ; Antonio De Oliveira, Juliano (EPL, 2020) [Artigo]
Some characteristics of scaling invariance are discussed for a transition from integrability to non-integrability in a class of dynamical systems described by a two-dimensional, nonlinear and area-preserving mapping. The ... -
Chaotic diffusion for particles moving in a time dependent potential well
Leonel, Edson D.; Kuwana, Célia Mayumi ; Yoshida, Makoto ; de Oliveira, Juliano Antonio (Physics Letters, Section A: General, Atomic and Solid State Physics, 2020) [Artigo]
The chaotic diffusion for particles moving in a time dependent potential well is described by using two different procedures: (i) via direct evolution of the mapping describing the dynamics and; (ii) by the solution of the ... -
Proton conduction mechanisms in GPTMS/TEOS-derived organic/silica hybrid films prepared by sol-gel process
Monteiro, Daniela A.; Gozzi, Giovani ; Chinaglia, Dante Luis ; ; de Vicente, Fabio S. (Synthetic Metals, 2020) [Artigo]
In this work, we employed impedance spectroscopy measurements to investigate the electrical properties of hybrid films obtained with the sol-gel process using 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethylorthosilicate ... -
Majorana molecules and their spectral fingerprints
Sanches, J. E.; Ricco, L. S. ; ; Mizobata, W. N. ; De Souza, M. ; ; Seridonio, A. C. (Physical Review B, 2020) [Artigo]
We introduce the concept of a Majorana molecule, a topological bound state appearing in the geometry of a double quantum dot structure flanking a topological superconducting nanowire. We demonstrate that, if the Majorana ... -
Tilted-hat mushroom billiards: Web-like hierarchical mixed phase space
da Costa, Diogo Ricardo; ; ; ; ; (Communications in Nonlinear Science and Numerical Simulation, 2020) [Artigo]
Mushroom billiards are formed, generically, by a semicircular hat attached to a rectangular stem. The dynamics of mushroom billiards shows a continuous transition from integrability to chaos. However, between those limits ... -
Unveiling the Physics of the Mutual Interactions in Paramagnets
Squillante, Lucas; F. Mello, Isys ; ; Seridonio, A. C. ; Lagos-Monaco, R. E. ; ; de Souza, Mariano (Scientific Reports, 2020) [Artigo]
In real paramagnets, there is always a subtle many-body contribution to the system’s energy, which can be regarded as a small effective local magnetic field (Bloc). Usually, it is neglected, since it is very small when ... -
The soft stadium's classical dynamics
; Lagos, R. E. (Journal of Physics: Conference Series, 2019) [Trabalho apresentado em evento]
Billiards are physical models employed to probe experiments that measure the conductivity of quantum dots. In this context, the stadium billiard have been adopted as an standard model for realizations. We study the effect ... -
Short-time kinetics of photorefractive gratings recorded under active phase control: an experimental method to materials characterization
; De Vicente, F. S. (Applied Physics B: Lasers and Optics, 2020) [Artigo]
The initial speed of photorefractive recording and erasure is investigated in two-wave mixing experiments under carefully controlled grating phase shifts. Results are reported for the full 2π range of possible phase shifts ... -
Critical Slowing Down at a Fold and a Period Doubling Bifurcations for a Gauss Map
de Oliveira, Juliano A.; de Mendonça, Hans M. J. ; da Silva, Anderson A. A. ; Leonel, Edson D. (Brazilian Journal of Physics, 2019) [Artigo]
The convergence to the stationary state is described using scaling arguments at a fold and a period doubling bifurcation in a one-dimensional Gauss map. Two procedures are used: (i) a phenomenological investigation leading ... -
N-Carbophenes: Two-dimensional covalent organic frameworks derived from linear N-phenylenes
; ; Paupitz, Ricardo (Materials Research Express, 2019) [Artigo]
N-Carbophene (carbophene) is a novel class of two-dimensional covalent organic frameworks (2DCOF), based on linear N-phenylenes, that have moderate band gaps and low-mobility bands surrounding the Fermi energy; the simplest ... -
Magnetic Grüneisen parameter for model systems
Gomes, Gabriel O.; Squillante, Lucas ; Seridonio, A. C. ; ; Lagos, Roberto E. ; De Souza, Mariano (Physical Review B, 2019) [Artigo]
The magnetocaloric effect (MCE), which is the refrigeration based on the variation of the magnetic entropy, is of great interest in both technological applications and fundamental research. The MCE is quantified by the ... -
Engineering of the band gap induced by Ce surface enrichment in Ce-doped SnO2 nanocrystals
; ; Villegas-Lelovsky, L.; ; ; (Applied Surface Science, 2020) [Artigo]
Surface modification of oxide semiconductors nanocrystals can promote news effects mainly in nanocrystals up to 10 nm in diameter. In these systems, the ratio surface/core is increased, and the quantum effect can not rule ... -
Growth and vacuum post-annealing effect on the structural, electrical and optical properties of Sn-doped In2O3 thin films
; ; ; ; Villegas-Lelovsky, L.; ; (Thin Solid Films, 2020) [Artigo]
Nowadays, the fabrication of cheaper, thermodynamically stable and durable transparent semiconducting oxide-based thin films are on high demand to enhance the properties of optoelectronic, sensing and energy harvesting ... -
Atomic frustrated impurity states in Weyl metals
Mizobata, W. N.; ; Penha, M. ; Sanches, J. E. ; Ricco, L. S. ; Souza, M. de ; ; Seridonio, A. C. (Physical Review B, 2020) [Artigo]
We theoretically analyze the effect of the inversion symmetry breaking on the structure of the impurity molecular states in Weyl metals. We show that for the case of a highly noncentrosymmetric Weyl metallic host, the ... -
On the reproducibility of spray-coated ZnO thin-film transistors
Lima, Guilherme R.; Braga, Joao P. ; Gozzi, Giovani ; Fugikawa-Santos, Lucas (Mrs Advances, 2020) [Artigo]
Recent studies have shown spray-pyrolysis is a low-cost, simple and efficient technique for deposition of metal oxide semiconductors (such as zinc oxide) as the active layer of thin-film transistors (TFTs). However, to ... -
Anisotropy of the spin-polarized edge current in monolayer transition metal dichalcogenide zigzag nanoribbons
; ; Villegas-Lelovsky, L.; ; ; (Physical Review B, 2020) [Artigo]
We report anisotropic spin polarization of edge currents in MoS2 and WS2 monolayer zigzag nanoribbons (ZNRs) deposited on either nonmagnetic or ferromagnetic insulator substrates. We employ an 11-band tight-binding model ... -
Tailoring the physical and chemical properties of Sn1-xCoxO2 nanoparticles: an experimental and theoretical approach
; Villegas-Lelovsky, L.; ; ; ; ; ; ; ; et al. (Physical Chemistry Chemical Physics, 2020) [Artigo]
In this work, we present a coupled experimental and theoretical first-principles investigation on one of the more promising oxide-diluted magnetic semiconductors, the Sn1-xCoxO2 nanoparticle system, in order to see the ... -
NiWO4 powders prepared via polymeric precursor method for application as ceramic luminescent pigments
; ; ; ; Mesquita, Alexandre; ; (Journal Of Advanced Ceramics, 2020) [Artigo]
NiWO4 was prepared using the polymeric precursor method and studied in terms of physical and chemical properties to verify its stability for industrial applications as pigments. The characterization was accomplished using ... -
Template-based fluoropolymer ferroelectrets with multiple layers of tubular channels
; ; ; ; ; ; Chinaglia, D. L.; ; ; (2010 Annual Report Conference On Electrical Insulation And Dielectic Phenomena, 2010) [Trabalho apresentado em evento]
Significant efforts are devoted to developing new ferroelectrets with well-controlled void distributions or uniform voids and with good long-term and thermal stability of the piezoelectricity. Here, we describe the concept, ... -
Photorefractive phase coupling measurement using self-stabilized recording technique
; ; Freschi, A. A.; ; ; (Riao/optilas 2007, 2008) [Trabalho apresentado em evento]
The measurement of the phase shift (p between the transmited and difracted beams interfering along the same direction behind the hologram recorded in a photorefractive crystal is directly and accurately measured using a ...