Ultracold dipolar molecules are excellent candidates for applications dealing with quantum technologies such as quantum simulation, quantum information, precision measurements and ultracold controlled chemistry [1]. Therefore a lot of effort is devoted nowadays in different international experimental groups to produce ultracold molecules in high densities.

One of a main goal is to create a quantum degenerate gas of dipolar molecules such as a Bose-Einstein condensate or a degenerate Fermi gas. However when the molecules start to collide, lot of molecules are lost in the process. Hoping for a long-lived quantum degenerate gas is then compromised unless to shield the molecules from collisional losses. This has been realized in a recent experiment [2] in very good agreement with our theoretical predictions proposed 5 years ago [3]. Another application of strong interest is the one of ultracold chemistry. Recently, the product state distribution of an ultracold chemical reaction has been observed and tuned by a magnetic field [4]. This tells us more about how a chemical reaction proceeds when the molecules approach each other.

The Master 2 internship will consist in a theoretical and numerical investigation of one of these two applications of strong current interest. The work will go beyond our recent findings [2,4] and could result in a publication of a scientific paper in a peer-review journal. The Master 2 internship can be pursued in our team by a PhD thesis.

It is recommended to have a good knowledge in Quantum Mechanics and in Atomic and Molecular Physics, especially in the Quantum Theory of Collisions (for a comprehensive lecture, see [5]). Skills in numerical programming are required, especially in Fortran 90. Knowledge in C, Matlab, Mathematica can still be useful.

[1] Bohn et al. Science 357, 1002 (2017)

[2] Matsuda et al., https://arxiv.org/abs/2009.07461 (2020)

[3] Wang et al., New J. Phys. 17, 035015 (2015)

[4] Hu et al., https://arxiv.org/abs/2005.10820 (2020)

[5] Quéméner, https://arxiv.org/abs/1703.09174

# Autres Propositions

Retour à la liste# Hydrogen deceleration for its first observation of the Gravitational Quantum States

Equipe MFC: Daniel Comparat / LKB

# Improved nanometric control of ions and electrons via laser ionization and coincident detection

Equipe MFC: Daniel Comparat, Yan Picard