GAMMA-X MIXING IN T-SHAPED AND V-SHAPED QUANTUM WIRES

We have applied both tight-binding (TB) and multivalley envelope funct ion (MEF) techniques to calculate the electronic states in T-and V-sha ped realistic quantum wires taking into account Gamma-X mixing in the conduction band. Strong reduction of the electron quantization energy due to the off-resonant Gamma-X mixing has been found in all types of quantum wires. This effect appears to be tied to the localization of t he electron wave function and to its overlap with atomic layers next t o interfaces.