Magneto-optical studies of GaAs/AlGaAs T-shaped quantum wire structures fabricated by cleaved edge overgrowth

摘要

The optical propertiels of T-shaped GaAs/AlGaAs quantum wire (QWR) waveguide structures are studied with a magnetic field oriented parallel or perpendicualr to the QWR axis. The QWRs were fabricated by the cleaved edge overgrwoth (CEO) technique. At low values of the magnetic field oriented perpendicular to the QWR axis, a strong increase in he light emission intenstiy is observed for all injection currents. For the magnetic field direction parallel to the QWR axis a completely different behavior is found. For magnetic field greater than 4 T a decrease in the intensity of the emitted light for injection currents below 0.125 mA is observed, while an increase is measured for injection currents larger than 0.125 mA. The origin of the effects induced by the magnetic field is interpreted in terms of optical propertieks of a one-dimensional (1D) system.