Crystalline phase of strongly interacting Fermi mixtures

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.

4 pages, 1 color figure, published version

References in corpus (6)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of Bose-Einstein Condensation of Molecules
• Weakly bound dimers of fermionic atoms
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Supersolid hardcore bosons on the triangular lattice
• Diatomic molecules in ultracold Fermi gases - Novel composite bosons

Cited by in corpus (7)

• Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
• Collisional properties of weakly bound heteronuclear dimers
• Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
• Casimir interaction among heavy fermions in the BCS-BEC crossover
• Confinement-induced Efimov resonances in Fermi-Fermi mixtures
• Structure and melting behavior of classical bilayer crystals of dipoles
• Molecular regimes in ultracold Fermi gases