论文标题
CDTE/CD_ {1-X} Mn_ {X} TE半磁性量子环中的激子磁极
Exciton magnetic polaron in CdTe/Cd_{1-x}Mn_{x}Te semimagnetic quantum ring
论文作者
论文摘要
磁掺杂的纳米结构可以显着增强带载体与掺杂剂原子之间的相互作用。通过证明具有增强的量子磁极偏振子（EMP）稳定性的增强的SP-D交换相互作用的激励，我们报告了CDTE/CD_ {1-X} MN_ {X} MN_ {X} TE稀释的磁性量子环（QR）中EMP形成的定量和定性分析。具有两种不同配置的QR：（i）在半磁环CD_ {1-x} Mn_ {x} te矩阵中嵌入的非磁环（CDTE），以及（ii）在环环和MN2+离子的磁性不均匀量子结构中，已在环形和壁炉架上进行了调查。与由CDMNTE制成的其他量子限制系统相比，估计5％摩尔MN含量的23mev的较大极极结合能（EMP）。 MP能量的磁场依赖性和相应的极性参数（如交换场，MP的定位半径以及由T = 4.2K时外部应用磁场引起的圆极化程度）的程度已得出。所获得的结果与外部磁场中EMP的显着降解的趋势非常吻合，以及QR的EMP趋势具有构型（I）和（II）的矛盾趋势，这是根据时间整合的测量结果所报道的，基于时间整合的测量结果，基于选择性激发CDMNTE和其他DMS材料的量子系统的选择性激发。
Magnetically doped nanostructures can significantly enhance the interaction between the band carriers and the dopant atoms. Motivated by the demonstration of the enhanced sp-d exchange interaction in quantum confined structures with the increased stability of the exciton magnetic polaron (EMP), we report the quantitative and qualitative analyses of the EMP formation in CdTe/Cd_{1-x}Mn_{x}Te diluted magnetic quantum ring (QR). The QR with two different configurations: (i) the non-magnetic ring (CdTe) embedded in the semimagnetic Cd_{1-x}Mn_{x}Te matrix, and (ii) magnetically non-uniform quantum structures embedded with Mn2+ ions both in the ring and in the barrier regimes, have been investigated for various mole fractions of the Mn dopants. The larger polaron binding energy (EMP) of 23meV is estimated for the 5% molar Mn contents compared to the other quantum confined systems made of CdMnTe. The magnetic field dependence of the MP energy and the corresponding polaron parameters like exchange field, localization radius of the MP, and the degree of circular polarization induced by the external applied magnetic field at T = 4.2K have been derived. The obtained results are in excellent agreement with the trend of the significant degradation of EMP in an external magnetic field, and with the contradictory tendencies of EMP for the QR with configuration (i) and (ii), as reported from the time-integrated measurements based on selective excitation for the quantum systems made of CdMnTe and other DMS materials.
