Program

P.24 -- Poster, NCTP-42

Date: Tuesday, 1 August 2017

Time: 16h00 - 17h30

Coherent potential approximation study of the three component Falicov-Kimball model

Thi-Huong Nguyen (1), Anh-Tuan Hoang (2), Duc-Anh Le (3)

(1) Water Resources University, Tay Son 175, Dong Da, Hanoi 10000, Viet Nam; (2) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Hanoi, Vietnam; (3) Faculty of Physics, Hanoi National University of Education Xuan Thuy 136, Cau Giay, Hanoi 10000, Vietnam.

We study the paramagnetic phase diagram in a three-component Falicov-Kimball model within the coherent potential approximation. The model can be realized in an optical lattice at ultra-low temperature as a mixture of two interacting fermion atom species. One species is immovable single-component atoms, in contrast, the orther species is movable two-component atoms. Depending on the atom filling conditions and local interaction strength, different correlation-driven metal-insulator transitions are observed. These metal-insulator transitions are investigated by monitoring the density of states at the Fermi level and the energy gap. Although our approach is analytically simple and numerically fast, the obtained results are in good agreement with the ones obtained by much more sophisticated theory. Keywords: three-component Falicov-Kimball; Metal-insulator transitions

Presenter: Nguyễn Thị Hương