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Fermion Mediated Interactions Between Ultracold Bosons



Ian B. Spielman, Subhadeep De


We describe a new method for creating spin-dependent long-range interactions between atomic ultra-cold neutral bosons in an optical lattice. In this proposal, the bosonic system is immersed in a spin polarized degenerate Fermi gas. We first show that the bosons acquire a long-range interaction analogous to RKKY interaction in solids. The resulting fermion mediated Bose-Bose interaction, which can depend on the bosons' spin state, is tunable using inter-species Feshbach resonance. When the bosons are subject to a suitable optical lattice, 3-body loss process are greatly suppressed. We conclude by showing that these interactions can lead to a supersolid phase for single spin Bose system, and also to a fully tunable transverse field Ising model for a two component Bose system.
Physical Review A


Bose Einstein Condensation, Bose Hubbard Model, feshbach resonances, phase diagrams, optical lattices


Spielman, I. and De, S. (2013), Fermion Mediated Interactions Between Ultracold Bosons, Physical Review A, [online], (Accessed July 23, 2024)


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Created June 16, 2013, Updated November 10, 2018