Год выпуска: 2014 Автор: Cong Tu Nguyen,Thierry Amand and Andrea Balocchi Издательство: Scholars' Press Страниц: 152 ISBN: 9783639510874
Описание
This work is a contribution to the investigation of the spin properties of III-V semiconductors with possible applications to the emerging semiconductor spintronics field. Two approaches have been explored in this work to achieve a long and robust spin polarization: i) Spatial confinement of the carriers in 0D nanostructured systems (quantum dots). ii) Defect engineering of paramagnetic centres in a bulk systems. Concerning the first approach, we investigated the polarization properties of excitons in nanowire-embedded GaN/AlN quantum dots. We evidence a sizeable and temperature insensitive linear polarization degree of the photoluminescence (~15 %) under quasi-resonant excitation with no temporal decay during the exciton lifetime. A detailed theoretical model has also been developed to account for the observed results. Regarding the second approach, we demonstrated a proof-of-concept of conduction band spin-filtering device based on the implantation of paramagnetic centres in...
