21 research outputs found
Optical spectroscopy of single beryllium acceptors in GaAs/AlGaAs quantum well
We carry out microphotoluminescence measurements of an acceptor-bound exciton
(A^0X) recombination in the applied magnetic field with a single impurity
resolution. In order to describe the obtained spectra we develop a theoretical
model taking into account a quantum well (QW) confinement, an electron-hole and
hole-hole exchange interaction. By means of fitting the measured data with the
model we are able to study the fine structure of individual acceptors inside
the QW. The good agreement between our experiments and the model indicates that
we observe single acceptors in a pure two-dimensional environment whose states
are unstrained in the QW plain
Optical orientation of spins in GaAs:Mn/AlGaAs quantum wells via impurity-to-band excitation
The paper reports optical orientation experiments performed in the narrow
GaAs/AlGaAs quantum wells doped with Mn. We experimentally demonstrate a
control over the spin polarization by means of the optical orientation via the
impurity-to-band excitation and observe a sign inversion of the luminescence
polarization depending on the pump power. The g factor of a hole localized on
the Mn acceptor in the quantum well was also found to be considerably modified
from its bulk value due to the quantum confinement effect. This finding shows
the importance of the local environment on magnetic properties of the dopants
in semiconductor nanostructures