Speaker
Description
Due to its simplicity, H$_2$ constitutes a perfect tool for testing fundamental physics: testing quantum electrodynamics, determining fundamental constants, or searching for new physics beyond the Standard Model. H$_2$ has a huge advantage over the other simple calculable systems of having a set of a few hundred ultralong living rovibrational states, which implies the ultimate limit for testing fundamental physics with H$_2$ at a relative accuracy level of 10$^{-24}$. The present experiments are far from this limit. I will present our so far results of an ongoing project aimed at trapping cold H$_2$. We develop an ultra-strong optical dipole trap. The time-dependent potential is going to recapture the coldest fraction of the cryogenic H$_2$ cloud. We develop a new type of cryogenic effusive valve to prepare a cryogenic H$_2$ sample.
[1] H Jóźwiak, P Wcisło, Scientific Reports 12, 14529 (2022)
[2] H Jóźwiak, TV Tscherbul, P Wcisło, J. Chem. Phys. 160, 094304 (2024)
[3] K. Stankiewicz, …, P. Wcisło, Nat. Phys. (2026, accepted) arxiv.org/abs/2502.12703