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Nature communications
12 16, 2019;10 (1): 5401.

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, Uri Banin
Author Information
  1. Jiabin Cui: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel. ORCID
  2. Yossef E Panfil: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
  3. Somnath Koley: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
  4. Doaa Shamalia: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
  5. Nir Waiskopf: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
  6. Sergei Remennik: The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
  7. Inna Popov: The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
  8. Meirav Oded: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
  9. Uri Banin: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel. uri.banin@mail.huji.ac.il. ORCID
PMID: 31844043 DOI: 10.1038/s41467-019-13349-1

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.

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Journal Article Research Support, Non-U.S. Gov't
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