Colloidal quantum dot molecules manifesting quantum coupling at room temperature
Colloidal quantum dot molecules manifesting quantum coupling at room temperature
复制标题
DOI：
10.1038/s41467-019-13349-1
复制
发表时间：
2019-12-16
影响因子：
16.6
通讯作者：
Banin, Uri
中科院分区：
文献类型：
--
作者：
Cui, Jiabin;Panfil, Yossef E.;Banin, Uri
原子的耦合是化学的基础，产生了分子的美妙和丰富性。我们利用半导体纳米晶体作为人造原子来形成在结构和电子方面耦合的纳米晶体分子。硒化镉/硫化镉核/壳纳米晶体连接形成二聚体，然后通过受限定向附着融合。对发生这种融合的可能的纳米晶体晶面进行了原子分辨率分析，揭示了可能的晶体融合情形的分布。带隙的红移体现了相干耦合和波函数杂化，这与量子力学模拟结果一致。单纳米粒子光谱揭示了与量子力学隧穿和能量转移机制的独特组合相关的耦合纳米晶体二聚体的特性。这为纳米晶体化学通过可控的核/壳纳米晶体构建单元产生多种耦合纳米晶体分子奠定了基础。这些对于显示器、传感、生物标记和新兴量子技术中的众多应用具有直接相关性。
Coupling of atoms is the basis of chemistry, yielding the beauty and richness of molecules. We utilize semiconductor nanocrystals as artificial atoms to form nanocrystal molecules that are structurally and electronically coupled. CdSe/CdS core/shell nanocrystals are linked to form dimers which are then fused via constrained oriented attachment. The possible nanocrystal facets in which such fusion takes place are analyzed with atomic resolution revealing the distribution of possible crystal fusion scenarios. Coherent coupling and wave-function hybridization are manifested by a redshift of the band gap, in agreement with quantum mechanical simulations. Single nanoparticle spectroscopy unravels the attributes of coupled nanocrystal dimers related to the unique combination of quantum mechanical tunneling and energy transfer mechanisms. This sets the stage for nanocrystal chemistry to yield a diverse selection of coupled nanocrystal molecules constructed from controlled core/shell nanocrystal building blocks. These are of direct relevance for numerous applications in displays, sensing, biological tagging and emerging quantum technologies.