A THEORETICAL-ANALYSIS OF QUANTUM-WIRE FABRICATION BY VACANCY-ENHANCED INTERDIFFUSION OF QUANTUM-WELLS

The fabrication of quantum-wire structures using vacancy enhanced inte rdiffusion of quantum wells is analyzed theoretically. A phenomenologi cal equation is used to describe the effects of strain on vacancy diff usion. The quantum-wipe confinement potentials are studied as a functi on of the trench opening widths and the separation distances from the SiO2-AlGaAs interface. The lateral confinement energy is not a monoton ic function of the trench opening width. It first increases and then d ecreases when the trench opening width is decreased. When the separati on distance of the quantum wire from the interface is reduced, the con finement potential is changed from a nonsquare profile to a square-wel l profile.