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We investigate electron transport through a diatomic molecule parallelly coupled to ferromagnetic source and drain contacts. We utilize a model Hamiltonian involving a Hubbard term in which the contacts are modeled using recently developed complex source and sink potentials. The zero bias transmission spectrum for a symmetrically coupled system as a function of the Fermi energy acquires a Fano lineshape as the Hubbard interaction is turned on. For large values of  U , the Fano lineshape broadens and shifts to higher energy values disappearing eventually. Meanwhile, the Breit–Wigner resonance located at the bonding resonance in the noninteracting limit survives but its position is shifted twice the coupling between the atoms in the molecule in the infinite  U  limit and its linewidth is reduced to half. We attribute this behavior to the unavailability of one of the transmission channels.

Tunable Fano resonance in a ferromagnetic diatomic molecular transistor