Abstract
We systematically investigate the slowed and stored light pulses, based on the dynamic effect of electromagnetically induced transparency (EIT), with the cold 87Rb atoms in the presence of magnetic fields. Especially, slow light splitting into two pulses with different group velocities was observed only in the case that a magnetic field perpendicular to propagation direction of the coupling and probe beams was applied. For light storage process, we find that the retrieved amplitude, which oscillates as a function of storage time, depends not only on the applied magnetic field but also on the ground state population distribution. This suggests that slow light and light storage in the presence of magnetic field can be used to determine the population distribution of the atomic system. Finally, the theoretical prediction is presented, which is in good agreements with the experimental results.