We study the entanglement properties of the one-dimensional dimerized Fermi-Hubbard model. Using a matrix product state approach, we compute the ground state and identify two insulating phases at 1/2- and 3/4-filling, along with a metallic phase. The underlying physical mechanisms of these phases are conclusively characterized by their entanglement spectra. Our findings demonstrate that the two insulating phases are physically distinct: the phase at 1/2-filling possesses a charge gap originating from the robust band gap enhanced by repulsive interactions, whereas the phase at 3/4-filling exhibits a Mott gap resulting from electron interactions. This fundamental distinction is faithfully reflected in the finite-entanglement scaling properties of the half-chain entanglement entropy and the universal distribution of the entanglement spectrum.

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• Entanglement entropy
• 1-dimensional systems
• Hubbard model
• Su-Schrieffer-Heeger model