CONFINEMENT AND SYMMETRY EFFECTS IN ELECTRONIC AND OPTICAL PROPERTIES OF GERMANIUM NANOSTRUCTURES

摘要

Germanium quantum size films and wires have been investigated regarding their electronic and optical properties. Ab initio calculations within the linearized augmented plane wave method have been employed for this purpose. Quantum confinement is found to shift the fundamental band gap of the bulk germanium to the blue energy range. The value of the upshift as well as the nature of the gap depends strongly on the surface symmetry. Strong direct gap absorption in the visible energy range has been predicted for germanium quantum films and wires.