Speaker
Description
We report on recent breakthroughs in two experiments employing Feshbach-resonant mixtures of fermions.
In radio-frequency spectroscopic measurements on fermionic $^{40}$K (or bosonic $^{41}$K) atoms immersed as impurities in a Fermi sea of $^6$Li atoms, we observed mediated polaron-polaron interactions [1]. Our results confirm the prediction of Fermi-liquid theory that the sign of this interaction depends on the impurity quantum statistics.
In experiments on a fermion mixture of $^{161}$Dy and $^{40}$K we demonstrate the formation of bosonic DyK Feshbach molecules and the preparation of a pure molecular sample in an optical dipole trap [1]. With a high phase-space density close to unity, we are approaching conditions of molecular Bose-Einstein condensation.
[1] Baroni et al., arXiv:2305.04915.
[2] Soave et al., arXiv:2304.07921.
