摘要
The linear-polarization optical property of CdSe quantum rods is studied in the framework of effectivemass envelope function theory. The effects of shape and magnetic field on the linear polarization factors are investigated. It is found that CdSe quantum spheres have negative polarization factors （xy-polarized emission）and quantum long rods with small radius have positive linear polarization factors （z-polarized emission）. The z-direction is the direction of the c axis. Quantum long rods with large radius have negative linear polarization factors,due to the hexagonal crystal symmetry and the crystal field splitting energy. The linear polarization factors decrease and may change from a positive value to a negative value;i, e. ,the z-polarized emissions decrease relative to xy-polarized emissions as the magnetic field applied along the z direction increases.
用有效质量包络函数理论研究了CdSe量子棒的线偏振光学性质,考虑了形状和磁场的影响.发现CdSe量子球具有负的线偏振因子(xy-平面内的线偏振发射) ,而小半径长量子棒具有正的线偏振因子(z-方向的线偏振发射) .z-方向就是晶格c-轴方向.因六角晶格对称性和晶格场劈裂能的影响,大半径长量子棒具有负的线偏振因子.线偏振因子随着z-方向磁场的增加而减小,可能由正变负,即z-方向的线偏振发射相对xy-平面内的线偏振发射减小了.
基金
国家自然科学基金(批准号:90301007)
国家重点基础研究专项基金(批准号:G001CB3095)资助项目~~
