Interacting Bose gas across a narrow Feshbach resonance

Abstract

We investigate the ground state properties of a weakly interacting Bose gas across a narrow Feshbach resonance. Strong deviation from a wide Feshbach resonance were discovered in varies thermodynamic quantities. The energy per particle was found to saturate as the density increases which leads to significant reduction of the inverse compressibility. We also show that these effects can be observed in the density profiles in harmonic traps.Comment: 10 pages, 6 figure