六方纳米网络材料中的激子
Excitons in hexagonal nanonetwork materials
摘要：
本文从理论上研究了六角纳米网络材料，如氮化硼（BN）片和纳米管中的光激发。沿BN键存在一个永久电偶极矩，其方向是从B位到N位。当激子跳跃积分限制在最近邻时，激子的平带出现在最低能量处。该激子带的对称性是光学禁戒的，表明弛豫到该带的激子将显示相当长的寿命，这将导致发光性质。
英文摘要：
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.
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