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Your search keyword '"da Cunha Lima, I. C."' showing total 107 results
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107 results on '"da Cunha Lima, I. C."'

1. Magneto-polariton: Strong tilted magnetic field applied on confined electron gas in a wide Ga1−xAlxAs quantum well.

Author

Dourado, T. P., Dias Cabral, E., Boselli, M. A., and da Cunha Lima, I. C.

Subjects
MAGNETIC fields, QUANTUM wells, FERMI level, ENERGY bands, ELECTRIC fields, ELECTRON gas
Abstract

The coupling of an electron gas confined by a harmonic potential and submitted to a strong magnetic field tilted in relation to the confining direction creates an excitation called here magneto-polariton. This work describes the origin of this excitation and calculates the energy eigenvalues for different tilted angles. It presents the reasons leading to the crossings and repulsions of the energy bands, the degeneracy of the states, the way the Fermi levels change with the magnetic field, the influence of an external electric field, and how the Hall resistance plateaus change with the change in the tilted angle. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Miniband Bloch conduction in semiconductor superlattices.

Author

Lei, X. L. and da Cunha Lima, I. C.

Subjects
*SUPERCONDUCTORS, *SUPERLATTICES
Abstract

Presents a study which examined linear and nonlinear characteristics of superconductor superlattice perpendicular conduction. Linear mobilities from the balance-equation theory; Comparisons between theories and experiments; Conclusions.

Published
1992
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16. Cross-correlation in a turbulent flow: Analysis of the velocity field using the ρDCCA coefficient.

Author

Brito, A. A., Santos, F. Rodrigues, Castro, A. P. N. de, da Cunha Lima, A. T., Zebende, G. F., and da Cunha Lima, I. C.

Abstract

The stochastic process of a turbulent flow in a pipeline provides a time series of the velocity field at any point of the domain by solving numerically the Navier-Stokes equation. The turbulent flow was produced by obstacles near the inlet, injecting eddies into the current. Moving downstream, these eddies evolve to a fully turbulent flow. Many length and time scales are involved in this process. We explore the cross-correlations of the velocity field time series at different points and also at different time scales using the detrended cross-correlation coefficient, ρDCCA, designed to analyze the cross-correlations in non-stationary time series. Thus, the results with ρDCCA allow interpreting how these eddies propagate downstream, and also quantify how adherent the velocity fields are with respect to the pipeline position. [ABSTRACT FROM AUTHOR]

Published
2018
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17. Magnetic interaction between GaMnAs layers via spin-polarized quasi-two-dimensional hole gas: Monte Carlo simulation.

Author

Boselli, M. A., Loureiro da Silva, L., da Cunha Lima, I. C., and Ghazali, A.

Subjects
MAGNETISM, ELECTRONIC structure, MONTE Carlo method, ESTIMATION theory
Abstract

The magnetic order resulting from an indirect exchange between magnetic moments in the metallic phase of a Ga[SUB1-x]Mn[SUBx]As bilayered structure is studied via Monte Carlo simulation. The coupling mechanism involves a perturbative calculation in second order of the interaction between the magnetic moments and carriers (holes). We take into account a possible polarization of the hole gas establishing, thus self-consistency between the magnetic order and the electronic structure. It leads to a ferromagnetic order even in the case of thin layers. This fact is analyzed in terms of the inter-and intralayer interactions. [ABSTRACT FROM AUTHOR]

Published
2003
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18. Magnetic ordering in GaAlAs:Mn double well structure.

Author

Boselli, M. A., da Cunha Lima, I. C., and Ghazali, A.

Subjects
*DILUTED magnetic semiconductors, *QUANTUM wells, *FERROMAGNETISM
Abstract

The magnetic order in the diluted magnetic semiconductor barrier of double AlAs/GaAs:Mn quantum well structures is investigated by Monte Carlo simulations. A confinement adapted RKKY mechanism is implemented for indirect exchange between Mn ions mediated by holes. It is shown that, depending on the barrier width and the hole concentration, a ferromagnetic or a spin-glass order can be established. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2000
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