Ionization of an exciton moving perpendicular to a magnetic field in the GaAs/AlxGa1-xAs superlattice

The magnetic field effect on the spectrum of excitons associated with vario us minibands in superlattices was studied by resonance Raman spectroscopy. It was found that the intensity of Raman scattering by acoustic phonons wit h the participation of the ground state of an exciton associated with the s econd miniband is sharply reduced even in weak magnetic fields if its veloc ity vector is orthogonal to the external magnetic field. This phenomenon wa s explained by the ionization of the exciton in the electric filed arising in the system of coordinate associated with the exciton moving perpendicula r to the external magnetic field. (C) 2001 MAIK "Nauka/Interperiodica".