Institution: | aGroupe d’Etude des Semi-Conducteurs, CNRS-UMR 5650, Université de Montpellier II, CC 074, 34095 Montpellier CEDEX 5, France;bCICECO, Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal;cFG Nanotechnology, Center of Micro- and Nanotechnologies, TU Ilmenau, PF 100565, 98684 Ilmenau, Germany |