Energy spectrum of harmonically trapped two-component Fermi gases: Three- and four-particle problem
Energy spectrum of harmonically trapped two-component Fermi gases: Three- and four-particle problem
Trapped two-component Fermi gases allow the investigation of the so-called BCS-BEC crossover by tuning the interspecies atom-atom $s$-wave scattering length ${a}^{(\mathit{aa})}$ from attractive to repulsive, including vanishing and infinitely large values. Here, we numerically determine the energy spectrum of the equal-mass spin-balanced four-fermion system---the smallest few-particle system that exhibits BCS-BEC …