Title of research project

Precision Measurements and tests of fundamental physics with cold molecules

Contract type Contrat (CDD) Category A Workload Fulltime

Scientific field Physique

WorklJob Descriptionoad

Description of the offer The PhD student will participate in the development of a new-generation molecular clock specifically designed for precision vibrational spectroscopy 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 measuring the electroweak-interactions-induced tiny energy difference between enantiomers of a chiral molecule, a signature of parity (left-right symmetry) violation, and a sensitive probe of dark matter. 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 increasingly being used internationally for instance to test fundamental symmetries, to measure fundamental constants or their variation in time, to 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 PhD student will take an active role in various aspects of the initial developments of the experiment which constitute major steps in providing such techniques for molecules. She/he will: - set up the mid-IR quantum cascade laser system at 6.4 μm and 15.5 μm to probe molecular vibrations in these spectral regions; - perform first Doppler and sub-Doppler absorption spectroscopy on cold molecules produced at ~1 K in a novel cold molecule apparatus, with a particular focus on well-chosen promising chiral and achiral organo-metallic species and polycyclic aromatic hydrocarbons.

Field of research Physics, Mid-IR molecular spectroscopy

Skills Frequency Metrology Mid-Infrared Optics Vacuum Technology Electronics Molecular Physics Cryogenic Buffer-Gas Cooling, Python coding/Simulation

Knowledge Quantum Physics, Rovibrational spectroscopy, laser physiqcs, Mid-IR photonics

Work environment

Location Villetaneuse

Laboratory Laboratoire de Physique des Lasers

Degree level

Degree required Master degree in physics, chemical physics, optics

Experience required

Additionnal information

Start date 10 01 26

Job Type Contrat doctoral

Salary 2300 € per month

Contract duration 3 ans

Composition of the selection jury

Application deadline 06 25 26

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