Regensburg 2010 – wissenschaftliches Programm
HL 24.4: Vortrag
Dienstag, 23. März 2010, 12:15–12:30, H17
Nanowire quantum dots as an ideal source of entangled photon pairs — •Ranber Singh and Gabriel Bester — Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
We predict that semiconductor nanostructures grown along the  direction such as self-assembled quantum dots or nanowire quantum dots have vanishing fine structure splitting on the grounds of their symmetry and therefore, are ideal candidates for the generation of entangled photon pairs. We confirm this predicton by million-atom empirical pseudopotential calculations on realistic InAsP/InP and InGaAs/GaAs structures. We further study how robust the results are against deformations. Through the control of size, shape and composition the InAsP/InP nanostructures would emit at the optical fiber communication wavelength (conventional C band) of 1.55 µm (0.8 eV) which should boost their attractiveness.