Formation dynamics of free excitonic magnetic polarons in Cd1−xMnxTe
Formation dynamics of free excitonic magnetic polarons in Cd1−xMnxTe
复制标题
Cd1−xMnxTe 中自由激子磁极化子的形成动力学
DOI：
10.1063/1.1357851
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发表时间：
2001
影响因子：
3.2
通讯作者：
Y. Oka
中科院分区：
文献类型：
--
作者：
M. Nogaku;R. Pittini;T. Sato;Jinxi Shen;Y. Oka
利用瞬态光致发光光谱研究了Mn组分x从0.02到0.1变化的Cd 1 −xMnxTe中激子形成磁极化子的过程。观察到两种激子磁极化子。一种是由自由激子组成的磁极化子，它通过交换相互作用与邻近的Mn离子自旋相互作用。另一种是由激子通过排列周围的Mn自旋与中性施主结合而形成的磁极化子。在x=0.02-0.05范围内出现施主束缚磁极化子，束缚能为0.5- 1.0meV。当x=0.02-0.1时，自由激子磁极化子出现，自由激子磁极化子的结合能在3.5-8.0 meV范围内随Mn的组成而变化。自由激子磁极化子态的稳定性证实了在宽的Mn组分范围内的强瞬态光致发光的外观。
Formation processes of magnetic polarons from excitons were studied in Cd1−xMnxTe with the Mn composition x varying from 0.02 to 0.1 by transient photoluminescence spectroscopy. Two kinds of excitonic magnetic polarons were observed. One is the magnetic polaron composed of the free exciton, which is interacting with neighboring Mn-ion spins by the exchange interaction. The other is the magnetic polaron composed of the exciton bound to the neutral donor by aligning the surrounding Mn spins. The donor bound magnetic polarons appear for x=0.02–0.05 with the binding energy of 0.5–1.0 meV. The free excitonic magnetic polarons arise for x=0.02–0.1, where the binding energy of the free excitonic magnetic polaron varies in the range of 3.5-8.0 meV depending on the Mn composition. The stability of the free excitonic magnetic polaron state is confirmed by the appearance of the strong transient photoluminescence in the wide Mn composition range.