2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/218993The microscopic properties of few interacting cold fermionic atoms confined in a two-dimensional (2D) harmonic trap are studied by numerical diagonalization. For repulsive interactions, a strong shell structure dominates, with Hund's rule acting at its extreme for the mid-shell configurations. In the attractive case, odd-even oscillations due to pairing occur simultaneously with deformations in the internal structure of the ground states, as seen from pair correlation functions.RevTeX 4.0, 4 pages, 5 colour postscript figuresMesoscale and Nanoscale PhysicsOther Condensed Mattertext