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Nanographene for quantum technologies

Subject Area Physical Chemistry of Solids and Surfaces, Material Characterisation
Synthesis and Properties of Functional Materials
Organic Molecular Chemistry - Synthesis and Characterisation
Term from 2020 to 2023
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 437130745
 
Final Report Year 2024

Final Report Abstract

The OPERA project aims at mastering the synthesis, the studies and the theoretical understanding of nanoscale graphene (nanographene) materials with perfectly defined structures and on-demand designed properties. The nanographene materials developed in OPERA will be studied in a series of quantum optics experiments in the view to evaluate their potential interest for quantum devices. To do so, OPERA gathers partners with complementary skills: chemical synthesis, theory/modelling, spectroscopy, and quantum optics. Over the last years, significant progress has been made on the development of nanographene materials with perfectly defined structures. This approach comes complementary to the important research efforts devoted to the 2D related materials beyond graphene that aimed at overcoming the limitation enforced by the semi-metal nature of graphene. Such research efforts are driven by the opportunity to obtain graphene-like materials with a sizable band gap as well as to develop well controlled single quantum objects, i.e. single photons sources. In this framework, the opportunity to finely tune and control the structure of nanographene by bottom-up chemistry is an important asset over the other approaches (i.e. top-down). This is indeed a key point if one wants to build a reliable structure-properties relationship. In a long-term vision, the ability of choosing and controlling the shape of graphene quantum dots can be used as a toolbox for quantum technologies. The possibility to organize them deterministically, and to create artificial quantum dot molecules, will then serve to implement quantum bits and gates. The OPERA project aims at defining a quantum chemistry engineering route using graphene quantum dots with atomically precise structure: Definition of the needed functionalities i.e. optical/electrical/magnetic properties, such as optically addressable spin for instance → Design and synthesis of the required graphene quantum dot structure → Study and use of the graphene quantum dot for quantum technologies. In this context, the objectives of this project are: i) synthesis of new graphene quantum dots exhibiting controlled shapes, edges (zig-zag or armchair) and properties, using the bottom-up approach; ii) evaluation of their optical properties through a combination of advanced experimental and theoretical studies; iii) integration of graphene quantum dot in cavity quantum electrodynamics (CQED) experiments. During the project, and despite the COVI19 crisis, the consortium has achieved different breakthrough: synthesis of new graphene quantum dot structures, comprehensive studies of their photophysics through optical experiments and advanced calculations, and the first studies of the vibrational structure of graphene quantum dots by low temperature experiments.

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