標題: | Magneto-optical response of layers of semiconductor quantum dots and nanorings |
作者: | Voskoboynikov, O Wijers, CMJ Liu, JL Lee, CP 應用數學系 電子工程學系及電子研究所 Department of Applied Mathematics Department of Electronics Engineering and Institute of Electronics |
公開日期: | 1-六月-2005 |
摘要: | In this paper a comparative theoretical study was made of the magneto-optical response of square lattices of nanoobjects (dots and rings). Expressions for both the polarizability of the individual objects as their mutual electromagnetic interactions (for a lattice in vacuum) was derived. The quantum-mechanical part of the derivation is based upon the commonly used envelope function approximation. The description is suited to investigate the optical response of these layers in a narrow region near the interband transitions onset, particularly when the contribution of individual level pairs can be separately observed. A remarkable distinction between clearly quantum-mechanical and classical electromagnetic behavior was found in the shape and volume dependence of the polarizability of the dots and rings. This optical response of a single plane of quantum dots and nanorings was explored as a function of frequency, magnetic field, and angle of incidence. Although the reflectance of these layer systems is not very strong, the ellipsometric angles are large. For these isolated dot-ring systems they are of the order of magnitude of degrees. For the ring systems a full oscillation of the optical Bohm-Ahronov effect could be isolated. Layers of dots do not display any remarkable magnetic field dependence. Both type of systems, dots and rings, exhibit an outspoken angular-dependent dichroism of quantum-mechanical origin. |
URI: | http://dx.doi.org/10.1103/PhysRevB.71.245332 http://hdl.handle.net/11536/13596 |
ISSN: | 2469-9950 |
DOI: | 10.1103/PhysRevB.71.245332 |
期刊: | PHYSICAL REVIEW B |
Volume: | 71 |
Issue: | 24 |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | 期刊論文 |