STAGE Offre de stage : Optical spectroscopy of graphene quantum dots

Date de mise à jour de l’offre

Laboratoire Aimé Cotton UMR 9188 :

le laboratoire est associé à l’Ecole Normale Supérieure de Cachan, dans la perspective de l’installation de cette école sur le campus de l’Université Paris­‐Saclay. Dans le cadre du « Centre de Physique Matière et Rayonnement » bénéficiant d’un financement des investissements d’avenir, le bâtiment du laboratoire sera rénové et agrandi pour passer d’une surface actuelle de 3500 m2 utiles à environ 5000 m2. Depuis le 1er janvier 2015, le laboratoire Aimé Cotton est une unité mixte de recherche ayant comme tutelles le CNRS, l’université Paris‐Sud et l’Ecole Normale Supérieure de Cachan.

Description de la mission

Graphene quantum dots are new nano-objects made of hundreds of carbon atoms. These atoms can be arranged in various geometries leading to a wide spread of properties. Their intermediate size between small molecules and solids makes them a perfect platform to test theoretical predictions both of quantum chemistry and condensed matter physics. However, accessing this potentialities requires to perform experiments at the single object level.
Recently, our group reported such experiments for the first time [1]. In particular we showed that graphene quantum dots emit single photons at room temperature with a high brightness and good photostability. The goal of the present internship/PhD project is to address in depth the intrinsic properties of these objects. For example, insights on electron-phonon coupling, emission statistics, many-body effects or intersystem crossing will allow adapting the properties of the graphene quantum dot to the aimed application in photonics, or biology. Similarly, the study of the blinking and spectral diffusion of the emitter will offer a unique way to probe its local environment. Thus, electrostatics environment can be characterized at the nanoscale .
This internship will benefit from the collaborations of the group with several groups specialized in the synthesis of graphene quantum dots by 'bottom-up' chemistry. These collaborations are a strong asset as the control of the structure gives an ultimate control on the intrinsic properties of the object. To date, our group is working on samples at the international state of the art.
[1] S. Zhao et al, Nature Communications 9, 3470 (2018)

Profil recherché

To carry out the internship, the candidate will use a microphotoluminescence setup working at cryogenic temperatures. The candidate must be motivated by experimental physics. Good knowledge of some of the following topics: optics, quantum mechanics, statistical physics and solid state physics will be a plus.

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    Laboratoire Aimé Cotton UMR 9188
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    De 51 à 250 salariés
  • Site internet de la structure
    http://www.lac.u-psud.fr
  • Type de stage ou contrat
    Stage pour lycéens et étudiants en formation initiale
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 4 mois et jusqu'à 6 mois
  • Le stage est-il rémunéré ?
    Oui
  • Niveau de qualification requis

    Bac + 4/5 et +
  • Lieu du stage
    bat 505 université paris Sud campus d'orsay
    Bat 505 Université paris sud
    91400 ORSAY
  • Accès et transports
    Rer B arret le guichet