Exploring the shell structure of trapped superfluid gases
arXiv:2607.14214
The paper uses quantum Monte Carlo simulations to study how the scattering length and effective range of attractive interactions affect shell structure in trapped two‑component Fermi gases, highlighting the dominant role of the effective range in the strongly interacting regime and its relevance to neutron‑rich nuclei.
Abstract
We provide quantum Monte Carlo calculations of a two-component Fermi system interacting with an attractive interaction confined in harmonic traps. We investigate the role of the interaction's scattering length and effective range and show its important role in modifying shell effects in the structure of these systems. We show that in the strongly interacting regime, where the scattering length is large, the dominant role to shell effects is due to the effective range. These conclusions are very relevant for nuclear physics, in particular for neutron-rich systems, and open the way to perform new atomic experiments that can help to explain the disappearance of shell-effects in nuclei.
9 pages, 6 figures