Abstract:We study the validity of Hund's first rule for the spin multiplicity in circular molecules -made of real or artificial atoms such as quantum dots -by considering a perturbative approach in the Coulomb interaction in the extended Hubbard model with both on-site and long-range interactions. In this approximation, we show that an anti-Hund rule always defines the ground state in a molecule with 4N atoms at half-filling. In all other cases (i.e. number of atoms not multiple of four, or a 4N molecule away from half… Show more
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