22 citations · 65 across the 8 of their papers we have counts for
8 papers
Direct optical probing of ultrafast spin dynamics in a magnetic semiconductor
S. C. P. van Kooten, G. Springholz, A. B. Henriques
We uncovered for the first time the spin dynamics involved in the birth and growth of giant spin polarons in a magnetic semiconductor. For this purpose, we developed a new measurem…
Modeling huge photoinduced spin polarons in intrinsic magnetic semiconductors
S. C. P. van Kooten, X. Gratens, A. B. Henriques
In intrinsic magnetic semiconductors, the absorption of a single photon can generate a spin polaron, whose magnetic moment reaches many thousands of Bohr magnetons [1.2]. Here we i…
Hypergiant spin polarons photogenerated in ferromagnetic europium chalcogenides
X. Gratens, Yunbo Ou, J. Moodera +2
We find that in the ferromagnetic semiconductor EuS, near its Curie temperature, a single band-edge photon generates a spin polaron (SP), whose magnetic moment approaches 20,000 Bo…
Converting Faraday rotation into magnetization in europium chalcogenides
S. C. P. van Kooten, P. A. Usachev, X. Gratens +4
We present a simple semiclassical model to sustain that in europium chalcogenides (EuX), Faraday rotation (FR) in the transparency gap is proportional to the magnetization of the s…
Ultrafast light switching of ferromagnetism in EuSe
A. B. Henriques, X. Gratens, P. A. Usachev +2
We demonstrate that light resonant with the bandgap forces the antiferromagnetic semiconducor EuSe to enter ferromagnetic alignment in the picosecond time scale. A photon generates…
Superlattice Magnetophonon Resonances in Strongly Coupled InAs/GaSb Superlattices
R. S. Deacon, A. B. Henriques, R. J. Nicholas +1
We report an experimental study of miniband magnetoconduction in semiconducting InAs/GaSb superlattices. For samples with miniband widths below the longitudinal optical phonon ener…
Measurement of miniband parameters of a doped superlattice by photoluminescence in high magnetic fields
R. F. Oliveira, A. B. Henriques, T. E. Lamas +2
We have studied a 50/50Åsuperlattice of GaAs/AlGaAs composition, modulation-doped with Si, to produce cm electrons per superlattice p…
Sharp lines in the absorption edge of EuTe and PbEuTe in high magnetic fields
L. K. Hanamoto, N. F. Oliveira, A. B. Henriques +3
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 circular…