Effective Potential for Ultracold Atoms at the Zero Crossing of a Feshbach Resonance
Figure 1
Scattering length and effective range for the -wave scattering of fermionic K atoms around the Feshbach resonance at G demonstrating the divergence in a coupled-channel calculation (symbols) [33] and in a zero-range model (full lines). The difference in the zero-range and coupled-channel models is caused by the presence of a bound state close to threshold in the open channel.
