Electronic and optical properties of self-assembled quantum wires.

摘要

We have studied the band and optical properties of self-assembled quantum wires. In particular, the band structures and optical matrix elements of strained multiple quantum-wires (QWR's) are investigated theoretically via the effective bond-orbital model (EBOM), which tales into account the effects of valence-band anisotropy and the band mixing. It is found that the strain leads to further confinement of carriers and enhancement of the anisotropy.; By using the EBOM and valence-force field model, we systematically studied the microstrain effects on the electronic and optical properties of Ga _1−xIn_xAs self-assembled quantum-wires (QWR's) made of short-period superlattices with strain-induced lateral ordering. Valence-band anisotropy, band mixing, tend effects due to local strain distribution at the atomistic level are all taken into account. A comprehensive collection of different structures in our model are presented.; Finally, the excitonic absorption spectrum for the SILO quantum wires are investigated by using our envelope function model.