Ferromagnetic ground states occur in square and rectangular four-dot plaquettes under derived hopping and interaction conditions, while a five-dot ring with four electrons has a partially polarized spin-1 ground state.
We use the same square configura- tion of four dots, but now add extra hopping terms t13 =t31 =t42 =t24 =−td
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Ferromagnetism in Quantum Dot Plaquettes
Ferromagnetic ground states occur in square and rectangular four-dot plaquettes under derived hopping and interaction conditions, while a five-dot ring with four electrons has a partially polarized spin-1 ground state.