STAGE Offre de stage : Precision Measurements and tests of fundamental physics with cold molecules

Date de mise à jour de l’offre

Laboratoire de Physique des Lasers de l'Université Paris 13 à Villetaneuse :

Les groupes étudient les interactions entre la lumière et la matière. Les expériences vont des domaines les plus fondamentaux à la recherche appliquée : physique quantique, atomique et moléculaire, dispositifs photoniques, optique biomédicale... Les thématiques scientifiques du laboratoire s'étendent jusqu'aux interfaces avec la chimie, la biologie et les nanotechnologies. La recherche au laboratoire est structurée en cinq axes et elle bénéficie du soutien de cinq services généraux. Il est constitué d’environ quatre-vingts personnes (10 chercheurs C.N.R.S., 30 enseignants-chercheurs, 15 personnels techniques, plus de 25 doctorants et post-doctorants) auxquelles s’ajoutent des stagiaires et des visiteurs étrangers.

Description de la mission

An internship position is available to pursue experimental research in the field of precise spectroscopic measurements with cold molecules in the gas phase. The project is focused on the development of a new-generation molecular clock specifically designed for precision vibrational spectroscopy (around 10 µm) of complex polyatomic molecules. The proposed technology is at the forefront of cold molecule research and frequency metrology, and opens possibilities for using polyatomic molecules to perform tests of fundamental physics and explore the limits of the standard model. The apparatus will be used in the first place for the measurement of the tiny energy difference between enantiomers of a chiral molecule induced by electroweak interactions, a signature of parity (left-right symmetry) violation.
Compared to atoms, molecular systems, owing to their numerous degrees of freedom, offer promising perspectives for improving tests of fundamental physics and precision measurements in general. Molecules are currently used to test fundamental symmetries, measure fundamental constants or their variation in time, test postulates of quantum mechanics. Many of these experiments can be cast as measurements of resonance frequencies of molecular transitions highlighting the importance of frequency metrology. They require advanced manipulation techniques already standard for atoms: individual hyperfine states addressing, high detection rates, long coherence times, cooling of both internal and external degrees of freedom. The instrumental developments to which the student will participate constitute major steps in providing such techniques for molecules.
The student will be expected to take an active role in the operation and development of this experimental activity, depending on his taste and on the status of the project: implementation a novel slow and intense source of cold polyatomic molecules, produced in a cryogenic chamber, so-called buffer-gas-cooled molecular beam; implementation of new laser sources emitting in the mid-infrared (3-25 µm) called quantum cascade lasers (QCLs) and development of a QCLs based Ramsey interferometer calibrated against primary frequency standards; implementation of a high-sensitivity microwave detector, for the detection of individual internal quantum states populations of cold molecules.Relevant publications:
Tokunaga et al, New J. Phys. 19, 053006 (2017), arXiv:1607.08741
Argence et al, Nature Photon. 9, 456 (2015), arXiv:1412.2207

Profil recherché

L3/M1 ou M2 The applicant will be expected to display the initiative and creativity, together with the appropriate skills and knowledge, required to meet the project goals.

Niveau de qualification requis

Bac + 3
  • Employeur
    Laboratoire de Physique des Lasers de l'Université Paris 13 à Villetaneuse
  • 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-lpl.univ-paris13.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 + 3
  • Lieu du stage
    LPL 99, avenue Jean-Baptiste Clément 93 430 VILLETANEUSE France
    99 Avenue Jean Baptiste Clément
    93430 VILLETANEUSE
  • Accès et transports
    Accès par les tramway T8 et T1 ou lle Transilien ligne H, à ~1/2 heure de Paris centre