STAGE Manybody physics with light in semiconductor microcavities

Date de mise à jour de l’offre

Centre de Nanosciences et de Nanotechnologies, C2N, UMR 9001, CNRS Centre national de la recherche scientifique DR4 Ile de France Gif sur Yvette :

Le Centre de nanosciences et de nanotechnologies - C2N (CNRS/Université Paris-Sud - Université Paris-Saclay), a été créé le 1er juin 2016 du regroupement de deux laboratoires franciliens leaders dans leur domaine : le Laboratoire de photonique et de nanostructures (CNRS) et l'Institut d'électronique fondamentale (CNRS/Université Paris-Sud). En 2018, les équipes s’installent dans un nouveau bâtiment au cœur du Campus Paris-Saclay. Le collège de direction du Centre de Nanosciences et de Nanotechnologies est composée du directeur, Giancarlo Faini, des quatre directeurs adjoints Laurent Vivien, Dafiné Ravelosona, Pierre-Yves Joubert et Jean-Christophe Harmand, ainsi que de la secrétaire générale Vanessa Tocut.

Description de la mission

Quantum simulation, first discussed by Richard Feynman [1], is an emerging experimental research field, which aims at understanding the eigenstates of quantum systems with many interacting particles. When the number of particles increases, the Hilbert space size diverges and the eigenstates are impossible to calculate with a classical computer. Richard Feynman proposed to learn about these eigenstates by realizing the experiment with a well-controlled artificial quantumsystem. While the most advanced platforms are cold atoms, trapped ions or superconducting loops, a very promising approach is to use photons in microcavities to realize such manybody quantum states. One advantage would be that multi photon entanglement could be imprinted on photons leaking out of the system, thus realizing a new source of quantum light. Our group at C2N has developed a unique expertise of designing lattices of coupled microcavities and pioneered the emulation of different Hamiltonians with these lattices [2]. We have realized the first topological
laser with a 1D lattice [3], explored Dirac physics with 2D honeycomb lattices [4]….
To induce photon-photon interactions and progress toward the simulation of manybody physics, we mix the cavity photons with electronic excitations, named excitons, created in quantum wells located in the cavity. The
resulting exciton-photon state, named cavity polaritons, shows significant interactions which have allowed demonstrating many fascinating properties such as superfluidity of light [5].
The challenge we propose now is to increase interactions to enter the strong quantum regime with single photon non-linearities. The work will start with the development and characterization of novel active materials, based on coupled quantum wells, which are expected to give rise to much
stronger interactions. These interactions will be measured by detailed low temperature spectroscopy and photon correlations. The smoking gun evidence for the quantum regime will be the measure of single photon emission. Then we will implement manybody Hamiltonians of increasing complexity building larger and larger lattices, and we will probe their quantum properties.
The work will be essentially experimental, with low temperature optical spectroscopy on micorcavity. The PhD student will participate to the processing of the samples, profiting from the unique technological environment that will be able in the new C2N clean room.

Profil recherché

Candidat ayant un fort gout pour le travail expérimental. Bonnes connaissances en mécanique
quantique, physique du solide, et interaction lumière-matière fortement souhaitée

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    Centre de Nanosciences et de Nanotechnologies, C2N, UMR 9001, CNRS Centre national de la recherche scientifique DR4 Ile de France Gif sur Yvette
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    Plus de 250 salariés
  • Site internet de la structure
    https://www.c2n.universite-paris-saclay.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
    C2N
    Avenue de la Vauve
    91120 PALAISEAU
  • Accès et transports
    Bus Albatrans depuis la station de Massy-Palaiseau RER B