Crystalline phase of strongly interacting fermi mixtures.
We show that the system of weakly bound molecules of heavy and light fermionic atoms is characterized by a long-range intermolecular repulsion and can undergo a gas-crystal quantum transition if the mass ratio exceeds a critical value. For the critical mass ratio above 100 obtained in our calculations, this crystalline order can be observed as a superlattice in an optical lattice for heavy atoms with a small filling factor. We also find that this novel system is sufficiently stable with respect to molecular relaxation into deep bound states and to the process of trimer formation.
Petrov
D S
DS
Laboratoire de Physique Théorique et Modèles Statistiques, CNRS, Université Paris Sud, 91405 Orsay, France.
Astrakharchik
G E
GE
Papoular
D J
DJ
Salomon
C
C
Shlyapnikov
G V
GV