  A microscopic study of the individual annealed (In,Ga)As/GaAs quantum dots is
done by means of high-resolution transmission electron microscopy. The
Cauchy-Green strain-tensor component distribution and the chemical composition
of the (In,Ga)As alloy are extracted from the microscopy images. The image
processing allows for the reconstruction of the strain-induced electric-field
gradients at the individual atomic columns extracting thereby the magnitude and
asymmetry parameter of the nuclear quadrupole interaction. Nuclear magnetic
resonance absorption spectra are analyzed for parallel and transverse mutual
orientations of the electric-field gradient and a static magnetic field.
