Giant optical anisotropy in cylindrical self-assembled InAs/GaAs quantum   rings
  Using a single-particle atomistic pseudopotential method followed by a many-particle configuration interaction method, we investigate the geometry, electronic structure and optical transitions of a self-assembled InAs/GaAs quantum ring (QR), changing its shape continously from a lens-shaped quantum dot (QD) to a nearly one dimensional ring. We find that the biaxial strain in the ring is strongly asymmetric in the plane perpendicular to the QR growth direction, leading to giant optical anisotropy. 
Weiwei Zhang, Zhiqiang Su, Ming Gong, Chuan-Feng Li, Guang-Can Guo,   Lixin He