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arXiv · 0706.2855

Crystalline phase of strongly interacting Fermi mixtures

D. S. Petrov·G. E. Astrakharchik·D. J. Papoular·C. Salomon·G. V. Shlyapnikov
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Abstract

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.

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D. S. Petrov, G. E. Astrakharchik, D. J. Papoular, C. Salomon, G. V. Shlyapnikov. 2007-10-04. Crystalline phase of strongly interacting Fermi mixtures. https://doi.org/10.1103/physrevlett.99.130407

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