Optical transitions of liquid phase epitaxy grown (Ga,Mn)As in magnetic fields

Low temperature (4.0 K) photoluminescence measurements of liquid phase epitaxy grown (Ga,Mn)As epilayers show distinctive donor–acceptor pair transitions. Below 0.3% Mn molar fractions, only one broad transition and its phonon echo were observed. However, exceeding 0.3%, three peaks at 1.409, 1.408 and 1.400 eV labeled as H, M and L, respectively, of acceptor related transitions were observed along with their phonon echoes. In the presence of magnetic field, the transitions are highly polarized to σ+ polarization and H peak shows free-carrier-like transition behavior whereas M and L peaks exhibit conventional donor–acceptor bound exciton transitions.