EXCITON TRAPPING, BINDING AND DIAMAGNETIC SHIFT IN T-SHAPED QUANTUM WIRES

We determine the exciton states of T-shaped quantum wires. We use anis otropic effective-mass models to describe the electron and hole states . Pair correlation along the wire axis and in the lateral directions i s included. We accurately model the measured redshifts between exciton photoluminescence in quantum wells and T-shaped wires. This redshift arises from enhanced exciton binding and the difference between well a nd wire confinement energy. We predict a large enhancement of binding energy only when lateral correlation is included, indicating that T-sh aped wires are quasi rather than quantum 1D wires. We calculate excito n shapes and diamagnetic shifts to determine how the exciton is distor ted when confined in a T-wire. (C) 1996 Academic Press Limited