Crystalline phase of strongly interacting Fermi mixtures

Details Crystalline phase of strongly interacting Fermi mixtures Crystalline phase of strongly interacting Fermi mixtures

2007-06-19

arxiv.org/abs/0706.2855v2

Phys. Rev. Lett. 99, 130407 (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 color figure, published version

Scientific paper

10.1103/PhysRevLett.99.130407

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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