Within a first-principles framework we show how many-body effects crucially modify the electronic and optical properties of free-standing Germanium nanowires. The electron-hole binding energy and probability distribution are found to depend on both wire size and orientation. Moreover, we observe an almost complete compensation of self-energy and excitonic effects for some of the analyzed quantum wires, which we explain as being due to their clusterlike atomic structure.
Bruno, M., Palummo, M., Marini, A., DEL SOLE, R., Olevano, V., Kholod, A., et al. (2005). Excitons in germanium nanowires: Quantum confinement, orientation, and anisotropy effects within a first-principles approach. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 72, 153310 [10.1103/PhysRevB.72.153310].
Excitons in germanium nanowires: Quantum confinement, orientation, and anisotropy effects within a first-principles approach
PALUMMO, MAURIZIA;DEL SOLE, RODOLFO;
2005-01-01
Abstract
Within a first-principles framework we show how many-body effects crucially modify the electronic and optical properties of free-standing Germanium nanowires. The electron-hole binding energy and probability distribution are found to depend on both wire size and orientation. Moreover, we observe an almost complete compensation of self-energy and excitonic effects for some of the analyzed quantum wires, which we explain as being due to their clusterlike atomic structure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
