Mass imbalanced fermions are great! In the CrLi lab we produce novel ultracold mixtures composed by Lithium and Chromium fermionic atoms. At the Cr-Li mass ratio exotic trimer states exist, which in turn will allow the first resonant control of elastic three-body interactions. This opens new perspectives for the study of elusive superfluid and magnetic phases with ultracold fermions.

Our preprint on ultracold collisions in 6Li-53Cr mixtures is now on the arXiv! We have performed extensive Feshbach spectroscopy of various spin combinations revealing more than 50 resonances between 0 and 1500 G. By means of a full coupled-channel model, we have unambiguously assigned a complete set of quantum numbers to each resonance and derived a thorough characterization of the scattering properties of our system. This has enabled us to identify several resonances suitable for future few-body and many-body studies of mass-imbalanced Fermi mixtures. What is more, our work paves the way to the production of a new class of ultracold molecules possessing both electric and magnetic dipole moments.

Stay tuned!

A. Ciamei et al.
Exploring ultracold collisions in 6Li-53Cr Fermi mixtures: Feshbach resonances and scattering properties of a novel alkali-transition metal system
arXiv:2203.12965 (2022)

In the middle of the hot Tuscan summer, we could bring to quantum degeneracy large samples of 6Li atoms in our setup. With the same all-optical strategies already developed in the LiLab, we can achieve crossover superfluids, as well as highly degenerate Fermi gases, of up to 1 million atoms. (In the image, the hydrodynamic expansion of a crossover superfluid of about 700000 pairs).

Matteo Zaccanti has been awarded with an ERC Starting Grant! The title of the project is "PoLiChroM: Superfluidity and ferromagnetism of unequal mass fermions with 2- and 3-body resonant interactions” (proposal #637738). Congratulations!

Cr/Li people

Antonio Cosco
Master student
Stefano Finelli
PhD student
Michele Pini
Postdoctoral fellow
Alessio Ciamei
Postdoctoral fellow
Andreas Trenkwalder
Scientific staff
Massimo Inguscio
Scientific staff
Matteo Zaccanti
Scientific staff
Former members:
Michael Jag
Elettra Neri
Cristiano Simonelli

Cr/Li contacts

For further information, request of material, job opportunities, please contact:

Matteo Zaccanti
(zaccanti@lens.unifi.it)

Cr/Li funding

ERC StG PoLiChroM
MIUR FARE P-HeLiCS
H2020-MSCA-IF-2019 CriLiN