STAGE Quantum magnetism of ultracold fermions in optical lattices

Date de mise à jour de l’offre

Centre national de la recherche scientifique (CNRS) IDF Villejuif :

Le Centre national de la recherche scientifique est un organisme public de recherche pluridisciplinaire placé sous la tutelle du ministère de l’Enseignement supérieur, de la Recherche et de l’Innovation. Missions : faire de la recherche scientifique, valoriser les résultats, partager les connaissances, former par la recherche, contribuer à la politique scientifique.

Description de la mission

We offer an experimental internship in the field of ultracold atoms. Our experiment produces degenerate gases of fermionic strontium 87 atoms, arranged on a periodic structure created by interfering laser beams: an optical lattice potential. This setting leads to the production of strongly correlated fermions, a category of systems prone to the rich phenomena of quantum magnetism, exotic conduction regimes, superconductivity, and many-body entanglement. Primarily a condensed matter topic, this theme is now explored in new settings by the so-called quantum simulators, such as our experiment.
Our system is specifically designed to realize generalizations of the Heisenberg model of antiferromagnetism to exotic large spins that have no equivalent system yet in other platforms. We can both realize situations analogous to those encountered by electrons (of spin ½) in crystalline materials, and novel situations as a consequence of the spin 9/2 of our atomic species (87Sr). There, novel magnetic phases are expected, such as spin liquids, with connections with topological materials and exotic forms of superfluidity.
Our focus is on the detection and characterization of many-body correlations, from classical alternate ordering up to the detection of purely quantum correlations (entanglement). By exploiting the narrow lines of strontium (in connection to atomic clocks), we are presently working on the deterministic preparation of low-energy spin textures, to study their dynamics and the growth of quantum correlations.
The intern will join our team during the optimization and characterization of the fidelity of these protocols to write spin textures onto the quantum degenerate lattice gas. We will then progress to the next stage, which is to study the many-body dynamics when these textures are either i) left to evolve freely under the influence of interactions, or ii) driven adiabatically to approach the strongly entangled ground state of the Heisenberg Hamiltonian. Moving towards this will involve work at different levels, such as i) the optimisation of the loading of the atoms in the optical lattices, to initiate the gas in a densely filled, insulating phase with small entropy; and ii) the characterization our new imaging system with high resolution (~1.2 µm) and close-to- single-atom detectivity...
We would like this internship to act as an introduction to a PhD thesis.

Profil recherché

Le stage est proposé à un candidat en Master 2.

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    Centre national de la recherche scientifique (CNRS) IDF Villejuif
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    Plus de 250 salariés
  • 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
    Institut Galilée - Université Sorbonne Paris Nord Laboratoire de Physique des Lasers
    99 avenue J.-B. Clément
    93430 VILLETANEUSE
  • Accès et transports
    RATP, Bus (https://www.ratp.fr/), SNCF (https://www.sncf.com/fr)