Controlling the Polarization of Light in InGaAs/GaAs/δ-Mn Ferromagnetic Diode Structures

A weak magnetic field is used to study the effect voltage has on the circular polarization of light in light-emitting diode structures with InGaAs/GaAs/δ-Mn quantum wells and remote δ layers of Mn magnetic impurities (spacers with thickness d_S = 2−5 nm). The weakening of circular polarization upon raising the applied voltage testifies to the strong contribution from the stationary mechanism of carrier polarization by the exchange field of the δ-Mn layer.