Issue
EPL
Volume 83, Number 6, September 2008
Article Number 67004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/83/67004
Published online 08 September 2008
EPL, 83 (2008) 67004
DOI: 10.1209/0295-5075/83/67004

Giant optical anisotropy in cylindrical self-assembled InAs/GaAs quantum rings

Weiwei Zhang, Zhiqiang Su, Ming Gong, Chuan-Feng Li, Guang-Can Guo and Lixin He

Key Laboratory of Quantum Information, University of Science and Technology of China, CAS Hefei, 230026, PRC

helx@ustc.edu.cn

received 13 May 2008; accepted in final form 24 July 2008; published September 2008
published online 8 September 2008

Abstract
Using a single-particle atomistic pseudopotential method followed by a configuration interaction treatment to many-particle interactions, we investigate the geometry, electronic structures and optical transitions of a self-assembled InAs/GaAs quantum ring (QR), with its shape changing continuously from a lens-shaped quantum dot (QD) to a nearly one-dimensional ring. We find that the biaxial strain inside the ring is strongly asymmetric in the plane perpendicular to the QR growth direction, leading to a giant optical anisotropy.

PACS
73.21.La - Quantum dots.
73.22.-f - Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals.
71.35.-y - Excitons and related phenomena.

© EPLA 2008