Programme

P.5 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Metal-insulator transitions in the two-dimensional ionic Hubbard model within coherent potential approximation.

Nguyen Thi Hai Yen, Hoang Anh Tuan

Institute of Physics

We employ the coherent potential approximation to investigate the phase diagram of the ionic Hubbard model on the square lattice. The results show the existence of two insulating phases: a band insulator in the region of large ionic potential \Delta and small Coulomb interaction $U$, and a Mott insulator in the regime of large $U$. Between these two insulating phases, a metallic phase emerges as an intermediate state. The obtained phase diagram is compared with those on the Bethe lattice.

Presenter: NGUYEN YEN