Using first-principles methods, we investigate the structural and electronic properties of SiGe nanowires-based heterostructures, whose lattice contains the same number of Si and Ge atoms but arranged in a different manner. Our results demonstrate that the wires with a clear interface between Si and Ge regions not only form the most stable structures but show a strongly reduced quantum confinement effect. Moreover, we, with the inclusion of many-body effects, prove that these nanowires-under optical excitation-display a clear electron-hole separation property which can have relevant technological applications.
Amato, M., Palummo, M., Ossicini, S. (2009). Reduced quantum confinement effect and electron-hole separation in SiGe nanowires. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 79(20), 201302 [10.1103/PhysRevB.79.201302].
Reduced quantum confinement effect and electron-hole separation in SiGe nanowires
PALUMMO, MAURIZIA;
2009-01-01
Abstract
Using first-principles methods, we investigate the structural and electronic properties of SiGe nanowires-based heterostructures, whose lattice contains the same number of Si and Ge atoms but arranged in a different manner. Our results demonstrate that the wires with a clear interface between Si and Ge regions not only form the most stable structures but show a strongly reduced quantum confinement effect. Moreover, we, with the inclusion of many-body effects, prove that these nanowires-under optical excitation-display a clear electron-hole separation property which can have relevant technological applications.Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons