Exciton Spin-Splitting in InxGa1—xAs Quantum Wires and Dots

Abstract

We have investigated the dependence of the splitting between the σ+ and the σ— polarized spectral lines of the ground state exciton transitions in InxGa1—xAs quantum wires and dots on the structure size by photoluminescence spectroscopy in magnetic fields up to B = 8 T. We find a drastic increase of the energy difference between these two lines with decreasing structure size which depends on the dimensionality of the structure. This increase can be attributed to the enhancement of the g‐factor with increasing spatial exciton confinement.