Stable molecular Fermi gases with strong dipolar interactions provide unique opportunities for studying exotic quantum matter such as p-wave superfluidity and extended Fermi-Hubbard models. I will first show our endeavors in understanding and controlling collisions of ultracold molecules, which eventually allow us to stabilize the molecular gas by microwave shielding. This technique enables the evaporation of polar molecules to temperatures well below the Fermi temperature. The intermolecular potential can be flexibly tuned by the microwave field, allowing us to observe field-linked resonances in collisions of polar molecules. It provides a universal tuning knob to independently control the dipolar interaction and contact interaction. In the end, I will present the creation of ultracold fieldlinked tetratomic molecules by electroassociation in a degenerate Fermi gas of microwaveshielded polar molecules. Additionally, I will discuss several exciting new possibilities associated with these field-linked molecules.
Xin-Yu Luo obtained his Ph.D. degree in the Institute of Physics, Chinese Academy of Science in 2013. He is the senior scientist leading the NaK molecules lab at the Max-Planck-Institute for Quantum Optics since 2018. He has been focusing on experiments of quantum manipulation and precision measurements with ultracold atoms and polar molecules. His current research interest is to understand and control the collisions of ultracold polar molecules and, subsequently, investigate strongly interacting dipolar quantum many-body systems.