Léger Y, Besombes L, Maingault L, Ferrand D, Mariette H
CEA-CNRS group Nanophysique et Semiconducteurs, Laboratoire de Spectrométrie Physique, CNRS and Université Joseph Fourier-Grenoble 1, St. Martin d'Hères, France.
Phys Rev Lett. 2005 Jul 22;95(4):047403. doi: 10.1103/PhysRevLett.95.047403.
The emission spectra of individual self-assembled quantum dots containing a single magnetic Mn atom differ strongly from dot to dot. The differences are explained by the influence of the system geometry, specifically the in-plane asymmetry of the quantum dot and the position of the Mn atom. Depending on both these parameters, one has different characteristic emission features which either reveal or hide the spin state of the magnetic atom. The observed behavior in both zero field and under magnetic field can be explained quantitatively by the interplay between the exciton-manganese exchange interaction (dependent on the Mn position) and the anisotropic part of the electron-hole exchange interaction (related to the asymmetry of the quantum dot).
单个包含单个磁性锰原子的自组装量子点的发射光谱在不同量子点之间存在很大差异。这些差异可以通过系统几何结构的影响来解释，具体而言是量子点的面内不对称性以及锰原子的位置。取决于这两个参数，会有不同的特征发射特性，这些特性要么揭示要么隐藏磁性原子的自旋状态。在零场和磁场下观察到的行为可以通过激子 - 锰交换相互作用（取决于锰的位置）与电子 - 空穴交换相互作用的各向异性部分（与量子点的不对称性有关）之间的相互作用来定量解释。
