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首页> 外文期刊>Nature nanotechnology >Excitonic pathway to photoinduced magnetism in colloidal nanocrystals with nonmagnetic dopants
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Excitonic pathway to photoinduced magnetism in colloidal nanocrystals with nonmagnetic dopants

机译：具有非磁性掺杂剂的胶体纳米晶体的激发磁性的激发途径

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摘要

Electronic doping of colloidal semiconductor nanostructures holds promise for future device concepts in optoelectronic and spin-based technologies. Ag+ is an emerging electronic dopant in III-V and II-VI nanostructures, introducing intragap electronic states optically coupled to the host conduction band. With its full 4d shell Ag+ is nonmagnetic, and the dopant-related luminescence is ascribed to decay of the conduction-band electron following transfer of the photoexcited hole to Ag+. This optical activation process and the associated modification of the electronic configuration of Ag+ remain unclear. Here, we trace a comprehensive picture of the excitonic process in Ag-doped CdSe nanocrystals and demonstrate that, in contrast to expectations, capture of the photohole leads to conversion of Ag+ to paramagnetic Ag2+. The process of exciton recombination is thus inextricably tied to photoinduced magnetism. Accordingly, we observe strong optically activated magnetism and diluted magnetic semiconductor behaviour, demonstrating that optically switchable magnetic nanomaterials can be obtained by exploiting excitonic processes involving nonmagnetic impurities.
机译：胶体半导体纳米结构的电子掺杂占据了光电和基于旋转技术的未来设备概念的承担。 AG +是III-V和II-VI纳米结构中的新兴电子掺杂剂，引入光学耦合到主机传导频带的Introgap电子状态。通过其全部4D壳体AG +是非磁性的，并且掺杂剂相关的发光在将光透射孔转移到Ag +之后将导电带电子的衰减归档。该光学激活过程和AG +电子配置的相关修改仍不清楚。在这里，我们追踪了Ag掺杂CdSe纳米晶体中激发过程的全面图像，并表明与期望相比，捕获光孔导致Ag +转化为顺磁ag2 +。因此，激子重组的过程与光诱导磁性有不可缩放。因此，我们观察到强光学活化的磁性和稀释的磁性半导体行为，证明了光学可切换的磁性纳米材料可以通过利用涉及非磁性杂质的兴奋过程来获得。

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