Giant Excitonic Exchange Splittings at Zero Field in Single Colloidal CdSe Quantum Dots Doped with Individual Mn2+ Impurities,Nano Letters

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Giant Excitonic Exchange Splittings at Zero Field in Single Colloidal CdSe Quantum Dots Doped with Individual Mn2+ Impurities
Nano Letters ( IF 9.6 ) Pub Date : 2016-09-28 00:00:00 , DOI: 10.1021/acs.nanolett.6b02775
Rachel Fainblat _{1,

2} , Charles J. Barrows ₂ , Eric Hopmann ₁ , Simon Siebeneicher ₁ , Vladmir A. Vlaskin ₂ , Daniel R. Gamelin ₂ , Gerd Bacher ₁

Affiliation

Replacing a single atom of a host semiconductor nanocrystal with a functional dopant can introduce completely new properties potentially valuable for “solotronic” information-processing applications. Here, we report successful doping of colloidal CdSe quantum dots with a very small number of manganese ions—down to the ultimate limit of one. Single-particle spectroscopy reveals spectral fingerprints of the spin–spin interactions between individual dopants and quantum-dot excitons. Spectrally well-resolved emission peaks are observed that can be related to the discrete spin projections of individual Mn²⁺ ions. In agreement with theoretical predictions, the exchange splittings are enhanced by more than an order of magnitude in these quantum dots compared to their epitaxial counterparts, opening a path for solotronic applications at elevated temperatures.

中文翻译：

单个Mn ²⁺杂质掺杂的单胶体CdSe量子点在零场处的巨激子交换分裂。

用功能性掺杂剂取代主体半导体纳米晶体的单个原子可以引入全新的特性，这些特性对于“ solotronic”信息处理应用具有潜在的价值。在这里，我们报道了用极少量的锰离子成功地掺杂了胶体CdSe量子点-降至一个极限。单粒子光谱学揭示了单个掺杂物和量子点激子之间自旋-自旋相互作用的光谱指纹。观察到光谱分辨良好的发射峰，可能与单个Mn ²⁺的离散自旋投影有关离子。与理论预测相符，与外延对应物相比，这些量子点的交换分裂提高了一个数量级以上，这为高温下的单电子应用提供了一条途径。

更新日期：2016-09-28

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