Exact many-electron ground states on the diamond Hubbard chain
Zsolt Gulacsi, Arno Kampf, Dieter Vollhardt
Abstract
Exact 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.
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