2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/134490Exact ground states of interacting electrons on the diamond Hubbard chain in a magnetic field are constructed which exhibit a wide range of properties such as flat-band ferromagnetism and correlation induced metallic, half-metallic or insulating behavior. The properties of these ground states can be tuned by changing the magnetic flux, local potentials, or electron density.4 pages, 2 figuresStrongly Correlated Electronstext