Colloidal quantum dot molecules manifesting quantum coupling at room temperature

Jiabin Cui, Yossef E. Panfil, Somnath Koley, Doaa Shamalia, Nir Waiskopf, Sergei Remennik, Inna Popov, Meirav Oded and Uri Banin ()
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Jiabin Cui: The Hebrew University of Jerusalem
Yossef E. Panfil: The Hebrew University of Jerusalem
Somnath Koley: The Hebrew University of Jerusalem
Doaa Shamalia: The Hebrew University of Jerusalem
Nir Waiskopf: The Hebrew University of Jerusalem
Sergei Remennik: The Hebrew University of Jerusalem
Inna Popov: The Hebrew University of Jerusalem
Meirav Oded: The Hebrew University of Jerusalem
Uri Banin: The Hebrew University of Jerusalem

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract 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.

Date: 2019
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DOI: 10.1038/s41467-019-13349-1

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