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The effects of mass imbalance in a three-component Hubbard model are studiedby the dynamical mean-field theory combined with exact diagonalization. Themodel describes a fermion-fermion mixture of two different particle specieswith a mass imbalance. One species is two-component fermion particles, and theother is single-component ones. The local interaction between particle speciesis considered isotropically. It is found that the mass imbalance can drive themixture from insulator to metal. The insulator-metal transition is aspecies-selective-like transition of lighter mass particles and occurs only atcommensurate particle densities and moderate local interactions. For weak andstrong local interactions the mass imbalance does not change the ground stateof the mixture.

Mass-imbalance induced metal-insulator transition in a three-component Hubbard model