Programme

P.15 -- Poster, VCTP-45

Date: Tuesday, 13 October 2020

Time: 08:30 - 10:00

Effect of ionic potential in a model of magnetic topological insulators

Thanh-Mai Thi Tran (1), Hong-Son Nguyen (2), Minh-Tien Tran (3)

(1) Hanoi National University of Education, 136 Xuan Thuy, Hanoi, Vietnam; (2) Department of Occupational Safety and Health, Trade Union University, 169 Tay Son, Ha Noi, Viet Nam ;(3) Institute of Physics, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

Research on the effect of different factors such as energy level splitting, disorder, spin-orbit couplings (SOC), spin-exchange (SE) on topological and magnetic properties in topological insulators doped with magnetic impurities has gained much attention from physical scientists. In this report, we only focused attention on the effect of the sonic potential in the Kane-Mele model of magnetic topological insulators. The dynamical mean-field theory (DMFT) was employed to investigate the electron dynamics. Both magnetic long-range order and the topological invariants were calculated within the mean-field theory. From the investigated results, we analyzed the effects of the ionic potential on the topological and long-range ordering properties as well as on their phase transitions. The insulator states were observed at half-filling, quarter-filling, and three-quarter filling. At half-filling, an antiferromagnetic topological insulator, which exhibits the quantum spin Hall effect, exists in the phase region between the paramagnetic topological insulator and the trivially topological antiferromagnetic insulator, like in the without energy level splitting case. Especially, the emergence of new phases besides the observed states. In comparison with the without energy level splitting case, the phase diagram becomes very rich when the energy level splitting is present.

Presenter: Nguyễn Hồng Sơn

Presentation file: