Excitons in hexagonal nanonetwork materials
光学
2016-09-08 v1 材料科学
强关联电子
化学物理
量子物理
摘要
Optical excitations in hexagonal nanonetwork materials, for example, Boron-Nitride (BN) sheets and nanotubes, are investigated theoretically. A permanent electric dipole moment, whose direction is from the B site to the N site, is considered along the BN bond. When the exciton hopping integral is restricted to the nearest neighbors, the flat band of the exciton appears at the lowest energy. The symmetry of this exciton band is optically forbidden, indicating that the excitons relaxed to this band will show quite long lifetime which will cause luminescence properties.
引用
@article{arxiv.physics/0404122,
title = {Excitons in hexagonal nanonetwork materials},
author = {Kikuo Harigaya},
journal= {arXiv preprint arXiv:physics/0404122},
year = {2016}
}