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.

Double-degenerate Fermi mixtures of 6Li and 53Cr atoms. A new quantum mixture in town!

We have reached simultaneous quantum degeneracy for fermionic Li and Cr atoms for the first time. In this work, we explain our all-optical strategy to realize large samples of more than 2x105 6Li and 105 53Cr atoms with T/TF as low as 0.25 in less than 13 s. Moreover, by use of a crossed bichromatic optical dipole trap, we are able to control the relative density and degree of degeneracy of the mixture components. This novel mass-imbalanced Fermi mixture, which we already proved to possess suitable Feshbach resonances in a previous work [Phys. Rev. Lett. 129, 093402 (2022)], opens the way to the observation of novel exotic few- and many-body phenomena, as well as the creation of ultracold polar paramagnetic LiCr molecules. Finally, our experimental methods can be exploited to realize large Fermi gases or homonuclear spin-mixtures of 53Cr, which will enable us to investigate the effects of weak dipolar interactions on BEC-BCS crossover physics.

Our results have been recently published in Physical Review A:

A. Ciamei et al.
Double-degenerate Fermi mixtures of 6Li and 53Cr atoms
Phys. Rev. A 106, 053318 (2022)

Cr/Li people

Stefano Finelli
PhD Student
Beatrice Restivo
PhD Student
Maximilian Schemmer
Research Fellow
Alessio Ciamei
Research Fellow
Andreas Trenkwalder
Scientific Staff
Massimo Inguscio
Scientific Staff
Matteo Zaccanti
Scientific Staff
Former members:
Antonio Cosco
Michael Jag
Elettra Neri
Michele Pini
Cristiano Simonelli

Cr/Li contacts

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

Matteo Zaccanti
(zaccanti@lens.unifi.it)