PHYSICAL REVIEW B 109, 115105 (2024)

ISSN: 2469-9950, SCIE

Swap Mott transition in multicomponent fermion systems

Duc-Anh Le,Thanh-Mai Thi Tran, and Minh-Tien Tran

Metal-insulator transitions in an asymmetric three-component Falicov-Kimball model are investigated within the two-site dynamical mean field theory. The model is obtained from the symmetry breaking of the SU (3) Hubbard model by imbalanced masses and nonequal local interactions of particle components. The Mott transitions are classified by the change in the number of distinct kinds of doublons across the transition. We observe a different Mott transition between partially localized states in which the particle components (flavors), which form the doublons, are swapped with each other but the number of distinct kinds of doublons is unchanged across the transition. The swap Mott transition occurs as a result of the competition between the Brinkman-Rice and the Falicov-Kimball localizations and the mass imbalance of the mobile particles.

DOI: 10.1103/PhysRevB.109.115105

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