Anisotropic carrier and exciton confinement in T-shaped quantum wires revealed by magneto-photoluminescence

Summary form only given.The realization of one-dimensional (1D) semiconductor nanostructures with large confinement energies is of importance for device applications. Different techniques such as growth on tilted substrates (Serpentine superlattices) or prepatterned substrates (V-groove quantum wires) and the cleaved-edge overgrowth of T-shaped structures have been demonstrated. For the T-shaped structures, the confinement energy has been recently increased to above 2k/sub B/T at room temperature by optimizing structure parameters. A decreased exciton diameter in the [110] direction in the wire compared with the [110] well was revealed by magneto-photoluminescence. We determine here the extension of the T-shaped quantum wire (T-QWR) state in both confining directions [110] and [001] to verify its 1D character, as shown for crescent-shaped wires.