Search Results - "Nunes, O. A.C."

Magnetic field effect on the laser-driven density of states for electrons in a cylindrical quantum wire: transition from one-dimensional to zero-dimensional behavior by Lima, C P, Lima, F M S, Fonseca, A L A, Nunes, O A C

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Photoacoustic Study of Fungal Disease of Acai (Euterpe oleracea) Seeds by Rezende, Denise V., Nunes, O. A. C., Oliveira, A. C.

“…Photoacoustic spectroscopy is introduced as a promising experimental technique to investigate fungus infected Acai ( Euterpe oleracea ) seeds. Photoacoustic…”
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Electronic properties of a quasi-two-dimensional electron gas in semiconductor quantum wells under intense laser fields by ENDERS, B. G, LIMA, F. M. S, NUNES, O. A. C, FONSECA, A. L. A, AGRELLO, D. A, QU, Fanyao, DA SILVA, E. F, FREIRE, V. N

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Terahertz laser-induced 1D–0D crossover in the density of states for electrons in a cylindrical semiconductor quantum wire by Lima, F.M.S., Nunes, O.A.C., Fonseca, A.L.A., Amato, M.A., Lima, C.P., da Silva, E.F.

“…The effects of a linearly polarized, terahertz laser field on the density of states (DOS) for carriers confined in a cylindrical semiconductor quantum wire are…”
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Quenching of magnetization in (III, Mn)V magnetic semiconductor quantum wells under intense laser field assisted by the quasi-two-dimensional electron gas by Mikhail, H.D., Fonseca, A.L.A., Amato, M.A., Agrello, D.A., Nunes, O.A.C.

“…Laser-induced quenching of ferromagnetism in ( III 1 − x , Mn x ) V quantum well magnetic semiconductor is investigated. We propose a mechanism in which an…”
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Korringa relaxation time of magnetic ion system near a two-dimensional electron gas by Souto, E, Nunes, O.A.C, Fonseca, A.L.A

“…Spin relaxation of Mn ions in a (Cd,Mn)Te quantum well with quasi-two-dimensional carriers (Q2DEG) is investigated. The mechanism of energy transfer is…”
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Photoacoustic spectroscopy of Baru – Dipteryx alata Vog by Rodriguez, A. F.R., Santos, J. G., Silveira, L. B., Oliveira, A. C., Morais, P. C., Nunes, O. A.C.

“… Photoacoustic spectroscopy (PAS) was used to investigate samples produced from Baru ( Dipteryx alata Vog.), a typical fruit from the Brazilian Cerrado, which…”
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Electron Mobility in One (Two)-Side Modulation-Doped GaAs/AlxGa1-xAs Asymmetric Quantum Wells by Lima, F.M.S., Fanyao, Qu, Nunes, O.A.C., Fonseca, A.L.A.

“…We have calculated the electron mobility in one (two)‐side modulation‐doped GaAs/AlxGa1—xAs asymmetric quantum wells. Coupled Schrödinger and Poisson equations…”
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Spin wave amplification in antiferromagnetic semiconductors stimulated by infrared laser field by Souto, E, Nunes, O.A.C, Agrello, D.A, Fonseca, A.L.A

“…The spin wave excitation induced by infrared laser radiation in antiferromagnetic semiconductors is considered. By considering that several photons from the IR…”
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Optical transitions involving impurities in semiconductors under additional infrared laser radiation by Nunes, O.A.C., Fonseca, A.L.A., Lima, F.M.S., Agrello, D.A.

“…The influence of an intense infrared (IR) laser field on the optical absorption edge associated to acceptor impurities of a direct-gap semiconductor is…”
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Intense laser field effects on the binding energy of impurities in semiconductors by Lima, F. M. S., Amato, M. A., Olavo, L. S. F., Nunes, O. A. C., Fonseca, A. L. A., da Silva, E. F.

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Screening Breakdown in a Plasma by Two Laser Fields and Strong DC Magnetic Field by Miranda, D. F., Guimarães, A. F., Fonseca, A. L. A., Agrello, D. A., Nunes, O. A. C.

“…The effective static dielectric constant of an electron plasma system in the simultaneous presence of two electromagnetic waves and a strong DC magnetic field…”
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Effect of residual acceptors on electron mobility in single asymmetric quantum wells by Lima, F.M.S., Fonseca, A.L.A., Nunes, O.A.C., Qu, Fanyao, Freire, V.N., da Silva, E.F.

“…We present the results of the calculation of the low-temperature electron mobility in one-side modulation-doped single asymmetric quantum wells, taking into…”
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Low-temperature photon-drag effect in magnetic semiconductors by Nunes, O.A.C, Agrello, D.A, Fonseca, A.L.A

“…The low-temperature photon drag (LTPD) effect due to direct spin-flip intraband photon absorption by conduction electrons during transitions between spin…”
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Photoinduced amplification of hypersound in superlattices by Nunes, O.A.C., Fonseca, A.L.A., Agrello, D.A.

“…The high-frequency acoustic-phonon scattering by electrons in superlattices in the presence of an intense radiation field is discussed. It is shown that in the…”
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Magnon instability in bulk magnetic semiconductors in two laser fields under quantizing magnetic fields by Fonseca, A.L.A., Nunes, O.A.C.

“…The magnon scattering by electrons in a bulk magnetic semiconductor in two laser fields in the additional presence of a quantizing (strong) magnetic field is…”
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Plasmon instability in strong magnetic fields by FONSECA, A. L. A, FERREIRA, J. L, NUNES, O. A. C

“…The problem of plasmon instability of an electron-plasmon system is studied. When the plasma electron have a net drift velocity relative to the background of…”
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Magneto-quantum oscillations of the Korringa relaxation rate of manganese ion near a two-dimensional electron gas by Souto, E., Nunes, O.A.C., Agrello, D.A., Fonseca, A.L.A., Da Silva, E.F.

“…The Mn ion-spin relaxation rate (Korringa relaxation) in the vicinity of the two-dimensional electrons (2DEG) in a Mn-based semiconductor nanostructures in a…”
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Laser-dressed binding energy of a hydrogen impurity in the GaAs/AlxGa1 − xAs nanostructure in the presence of a static electric field by Fanyao, Q., Fonseca, A.L.A., Nunes, O.A.C.

“…We set up a calculation for the ground-state binding energy of an on-center hydrogenic impurity in the simultaneous presence of intense high-frequency laser…”
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Interface effects in modulation-doped GaAs/AlGaAs single quantum wells and superlattices by Bezerra, M.G., Freire, J.A.K., Freire, V.N., Farias, G.A., Lima, F.M.S., Fonseca, A.L.A., Nunes, O.A.C.

“…We investigate how the existence of interface graduation can modify the electronic properties in n and p-type modulation-doped GaAs/AlxGa1−xAs single quantum…”
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