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Portail > Offres > Offre UMR7538-BENDAR-010 - Chercheur postdoctoral H/F en physique atomique et moléculaire expérimentale

Postdoctoral Researcher (M/F) in Experimental Atomic and Molecular Physics

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : vendredi 26 août 2022

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General information

Reference : UMR7538-BENDAR-010
Date of publication : Friday, August 5, 2022
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 15 November 2022
Proportion of work : Full time
Remuneration : between €2740 and €3900 gross per month depending on experience
Desired level of education : PhD
Experience required : Indifferent


Coherent Microwave manipulation of atoms and molecules in cryogenic environments for fundamental studies

The 2-year post-doctoral position is part of the project EDMMA (Towards an Electric Dipole Moment with atoms and molecules in Matrix) funded by ANR. The long-term goal of EDMMA is to develop very sensitive methods to measure the electric dipole moment (EDM) of electrons in atoms or molecules embedded in a cryogenic matrix of rare gas or para-hydrogen. This requires to control and measure the spin of atoms or molecules in this cryogenic environment using microwave and optical radiations. The successful applicant will be successively hosted by two Paris region laboratories: Laboratoire de Physique des Lasers (LPL), under the supervision of B. Darquié (1st year) and Laboratoire Aimé Cotton (LAC), under the supervision of D. Comparat (2nd year).

Key words: atomic and molecular physics, quantum physics, precision measurements, electric dipole moment of the electron (eEDM), cryogenic, cold atoms/molecules, matrix isolation spectroscopy, buffer-gas cooling, frequency metrology, Ramsey spectroscopy, microwave, optics and lasers, vacuum techniques, electronics, programming and simulation.


LPL is developing molecular clocks for precision vibrational spectroscopy of cold species in the gas phase to test fundamental physics. The proposed technology is at the forefront of cold molecule research and frequency metrology. During year 1, the successful applicant will work on a molecular jet Ramsey interferometry setup based on a cryogenic buffer-gas-cooled molecular beam. She/he will primarily implement in a cryostat the microwave (MW) instrumentation already working at room temperature needed to manipulate and detect with high sensitivity internal molecular states by measuring free induction decay (FID) signals.
During year 2, the post-doctoral researcher will transfer this MW knowledge to LAC. She/he will work on an experiment that uses caesium (Cs) atoms embedded in a cryogenic matrix with the aim of measuring a possible permanent EDM of the electron that should result in an energy level shift for the caesium valence electron. She/he will construct a similar MW setup dedicated to measure relaxation and coherence times of the hyperfine structure of Cs in an argon matrix. The pros and cons of detecting FID signals in the optical domain (in the absorption of an optical pumping beam) or directly in the MW (using pick-up antennas) will be assessed.


The applicant should have a PhD in a relevant area of experimental physics or chemical physics: molecular, atomic physics, spectroscopy, optics and lasers, quantum optics. She/he will be expected to display the initiative and creativity, together with the appropriate skills and knowledge, required to meet the project goals.

Work Context

The EDMMA project funded by ANR is a collaboration between LAC, LPL, Institut des Sciences Moléculaires d'Orsay (ISMO) and Centre de recherche sur les Ions, les Matériaux et la Photonique (CIMAP). The activity will take place during the 1st year at LPL, Université Sorbonne Paris Nord, Villetaneuse, within the 'Metrology, Molecules and Fundamental Tests' team (MMFT) and during the 2nd year at LAC, Université Paris Saclay, Orsay, within the Condensed Cold Matter team (MFC).

The successful applicant will strongly interact with both groups throughout the duration of the project and will thus have a decisive role to maximise the synergy between them, for an optimal knowledge transfer.

Constraints and risks

Not applicable.

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