Interaction-resistant metals in multicomponent Fermi systems

We analyze two different fermionic systems that defy Mott localization showing a metallic ground state at integer filling and very large Coulomb repulsion. The first is multiorbital Hubbard model with Hund's coupling (this physics has been widely studied, the new called metal), second SU(3) patterned single-particle potential designed to display similar interaction-resistant metal in setup which can be implemented $\mathrm{SU}(N)$ ultracold atoms. With simple analytical arguments exact numerical diagonalization of Hamiltonians for minimal three-site system, we demonstrate emerges both cases as compromise between insulating solutions are stabilized by terms models. This provides strong evidence specific realization more general phenomenon realized various strongly correlated systems.