STAGE Precision Measurements and tests of fundamental physics with cold molecules

Date de mise à jour de l’offre

Laboratoire de Physique des Lasers, CNRS-Université Paris 13 :

Le Laboratoire de Physique des Lasers est une Unité Mixte de Recherche du CNRS (UMR 7538) et de l' Université Sorbonne Paris Nord Nous étudions les interactions entre la lumière et la matière. Nos 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.

Description de la mission

An internship position is available to develop a new-generation molecular clock for precision
vibrational spectroscopy (around 10 μm) of cold molecules in the gas phase. 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 (tests of fundamental symmetries, measurements of fundamental constants or their
variation in time, tests of postulates of quantum mechanics, search for dark matter, …). Many of
these experiments can be cast as measurements of resonance frequencies of molecular transitions
highlighting the importance of frequency metrology. They also require advanced manipulation
techniques already standard for atoms: individual states addressing, high detection rates, long
coherence times, cooling of internal and external degrees of freedom.
The student will participate in various aspects of the development of the experiment constituting
major steps in providing such techniques for molecules, such as (depending on his taste and on the
status of the project):
- in collaboration with Imperial College London, development of an intense source of cold and slow
polyatomic molecules produced in a cryogenic chamber called a buffer-gas-cooled beam, one of
the latest cold molecule technology that has so far mostly been implemented on simple species;
- precise probing of these cold molecules with high-purity mid-infrared quantum cascade lasers
calibrated to primary frequency standards using saturated absorption spectroscopy and Ramsey
interferometry, the same quantum optics method as used in the world’s best atomic clocks;
- implementation of a high-sensitivity microwave detector, for the detection of individual internal
quantum states populations of cold molecules;
- development of advanced manipulation techniques combining ultrastable RF, microwave and
optical fields to obtain individual state addressing, high detection rates, long coherence times,.....

Profil recherché

Good knowledge of basic physics, a good expertise in experimental physics (in particular in
experimental optics) and/or in programming/simulation would be welcome, curiosity, creativity

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    Laboratoire de Physique des Lasers, CNRS-Université Paris 13
  • 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 + 4/5 et +
  • Lieu du stage
    Laboratoire de Physique des Lasers, CNRS-Université Paris 13 99 avenue J.-B. Clément
    93430 VILLETANEUSE
  • Accès et transports
    RER B => Tram 11 ou RER D => Tram 11 ; Tram 8 ; francilien ligne H depuis Gare du Nord