Kaminski, B., Lafrentz, M., Pisarev, R. V., Yakovlev, D. R., Pavlov, V. V., Lukoshkin, V. A., ...
Spectroscopy of the centrosymmetric magnetic semiconductors EuTe and EuSe reveals spin-induced optical second harmonic generation (SHG) in the band gap vicinity at 2.1-2.4eV. The magnetic field and...
Superlattice Magnetophonon Resonances in Strongly Coupled InAs/GaSb Superlattices (2007)
Deacon, R. S., Henriques, A. B., Nicholas, R. J., Shields, P. A.
We report an experimental study of miniband magnetoconduction in semiconducting InAs/GaSb superlattices. For samples with miniband widths below the longitudinal optical phonon energy we identify a...
Monte Carlo Studies of Miniband Conduction in Extreme Type-II Superlattices (2006)
A.B. Henriques, R. Deacon, R. J. Nicholas
Monte Carlo Studies of Miniband Conduction in Extreme Type-II Superlattices
Luminescence from Miniband States in Heavily Doped Superlattices (2006)
R.F. Oliveira, A.B. Henriques, T.E. Lamas, A.A. Quivy, M.P. Pires, P.L. Souza, ...
Luminescence from Miniband States in Heavily Doped Superlattices
Magnetic Field Induced Absorption in PbxEu1-xTe Magnetic Semiconductors (2006)
A.B. Henriques, E. Abramof, A.Y. Ueta, L. K. Hanamoto, N. F. Oliveira
Magnetic Field Induced Absorption in PbxEu1-xTe Magnetic Semiconductors
Monte Carlo studies of miniband conduction in extreme type-II superlattices (2004)
Henriques,A. B., Deacon,R., Nicholas,R. J.
Miniband charge transport was investigated by Monte Carlo simulations of electronic motion in short period superlattices of type-II energy band alignment (InAs/GaSb composition). The strong decrease...
Luminescence from miniband states in heavily doped superlattices (2004)
Oliveira,R.F., Henriques,A.B., Lamas,T.E., Quivy,A.A., Pires,M.P., Souza,P.L., ...
We have studied doped superlattices of GaAs/AlGaAs composition. When the doping atoms are introduced into the barriers surrounding the superlattice, as well as to the inner ones, but with half of the...
Magnetic field induced absorption in Pb xEu1-xTe magnetic semiconductors (2004)
Hanamoto,L. K., Henriques,A. B., Oliveira,N. F., Ueta,A. Y., Abramof,E.
We report an investigation of the optical absorption spectrum, using non-polarized light, in Pb xEu1-xTe, x=0 and x=0.095, epitaxial thick layers grown by molecular beam epitaxy (MBE). The absorption...
Oliveira, R. F., Henriques, A. B., Lamas, T. E., Quivy, A. A., Abramof, E.
We have studied a 50/50\AA superlattice of GaAs/Al$_{0.21}$Ga$_{0.79}$As composition, modulation-doped with Si, to produce $n=1.4\times 10^{12}$ cm$^{-2}$ electrons per superlattice period. The...
Sharp lines in the absorption edge of EuTe and Pb$_{0.1}$Eu$_{0.9}$Te in high magnetic fields (2003)
Hanamoto, L. K., Oliveira Jr, N. F., Henriques, A. B., Rappl, P., Abramoff, E., Ueta, Y.
The optical absorption spectra in the region of the \fd transition energies of epitaxial layers of of EuTe and \PbEuTe, grown by molecular beam epitaxy, were studied using circularly polarized light,...
nipi delta-doping superlattices for amplitude modulation (2002)
Tribuzy,C. V.-B., Landi,S. M., Pires,M. P., Butendeich,R., Souza,P. L., Bittencourt,A. C., ...
GaAs/AlGaAs multiple quantum well structures containing an nipi delta-doping superlattice, where the n-type doping is inserted in the quantum wells and the p-type in the barriers, have been studied...
Interfacial layers and impurity segregation in InP/In0.53Ga0.47As superlattices (2002)
Hanamoto,L. K., Henriques,A. B., Tribuzy,C. V.-B., Souza,P. L., Yavich,B., Abramof,E.
The interfaces in InP=In0.53 Ga0.47As superlattices modulation doped with Si were investigated using magneto-transport, capacitance-voltage, and high resolution X-ray diffraction measurements....
Cosmic microwave background and parametric resonance in reheating (2001)
Henriques, A. B., Moorhouse, R. G.
The variation of the perturbative 3-curvature parameter, \zeta, is investigated in the period of reheating after inflation. The two-field model used has the inflaton, with an extra scalar field...
Inflaton Particles in Reheating (2000)
Henriques, A. B., Moorhouse, R. G.
In many theories of reheating starting from the classical spatially homogeneous inflaton field, its accompanying inhomogeneous part (which arises from primordial quantum fluctuations) is treated as a...
Post-Inflationary Reheating (2000)
Henriques, A. B., Moorhouse, R. G.
We study a model for reheating that has been much investigated for parametric resonance, having a quartic interaction of the scalar inflaton with another scalar field. Attention is particularly on...
High magnetic field transport and photoluminescence in doped InGaAs/InP superlattices (1999)
Henriques,A.B., Hanamoto,L.K., Oliveira,R.F., Souza,P.L., Gonçalves,L.C.D., Yavich,B.
Lattice-matched InP/InxGa1- x As short period superlattices (x = 0.53) delta-doped with Si in the middle of the InP barriers were studied. The samples had a high carrier concentration which filled...
Post-inflationary reheating and perturbations of the cosmic microwave background (1997)
Moorhouse, R. G., Henriques, A. B., Mendes, L. E.
We formulate a gradual dynamical transition from a power-law inflation era with a scalar field to a radiation era with no scalar field including inhomogeneous perturbations to the Friedmann-...
Density and Graviton Perturbations in the Cosmic Microwave Background (1997)
Henriques, A. B., Mendes, L. E., Moorhouse, R. G.
This paper evaluates and compares the gravitational wave and density perturbation contributions to the cosmic microwave background radiation, on the basis of the same power law inflationary model....
An Exact Calculation of the Energy Density of Cosmological Gravitational Waves (1994)
Mendes, L. E., Henriques, A. B., Moorhouse, R. G.
In this paper we calculate the Bogoliubov coefficients and the energy density of the stochastic gravitational wave background for a universe that undergoes inflation followed by radiation domination...