Vibronic fingerprints in the luminescence of graphene quantum dots at cryogenic temperature

Thomas Liu (1, 2) , Baptiste Carles (1, 2) , Christine Elias (1, 2) , Claire Tonnelé (3) , Daniel Medina-Lopez (4) , Akimitsu Narita (5) , Yannick Chassagneux (6) , Christophe Voisin (6) , David Beljonne (3) , Stéphane Campidelli (4) , Loïc Rondin (1, 2) , Jean‐sébastien Lauret (1, 2)

1 NOOS - Nano Optique et Spectroscopy
2 LuMIn - Laboratoire Lumière, Matière et Interfaces
3 UMONS - Université de Mons / University of Mons
4 LICSEN UMR 3685 - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
5 MPI-P - Max-Planck-Institut für Polymerforschung
6 Nano-Optique

Atomically precise graphene quantum dots synthesized by bottom-up chemistry are promising versatile single emitters with potential applications forquantum photonic technologies. Towards a better understanding and control of GQDs' optical properties, we report on single-molecule spectroscopy at cryogenictemperature. We investigate the effect of temperature on GQDs' spectral linewidth and vibronic replica which we interpret building on DFTcalculations. Finally, we highlight that the vibronic signatures are specific to the GQDs geometry and can be used as a fingerprint for identification purposes.

Domains: Condensed Matter [cond-mat]; Quantum Physics [quant-ph]

Thomas Liu, Baptiste Carles, Christine Elias, Claire Tonnelé, Daniel Medina-Lopez, et al.. Vibronic fingerprints in the luminescence of graphene quantum dots at cryogenic temperature. The Journal of Chemical Physics, 2022, 156 (10), pp.104302. ⟨10.1063/5.0083282⟩. ⟨hal-03585050⟩