CAJ | 학술논문

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.
용유효질량포락함수이론연구료CdSe양자봉적선편진광학성질,고필료형상화자장적영향.발현CdSe양자구구유부적선편진인자(xy-평면내적선편진발사),이소반경장양자봉구유정적선편진인자(z-방향적선편진발사).z-방향취시정격c-축방향.인륙각정격대칭성화정격장벽렬능적영향,대반경장양자봉구유부적선편진인자.선편진인자수착z-방향자장적증가이감소,가능유정변부,즉z-방향적선편진발사상대xy-평면내적선편진발사감소료.
The linear-polarization optical property of CdSe quantum rods is studied in the framework of effective-mass 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.