Programme

P.24 -- Poster, VCTP-44

Date: Tuesday, 30 July 2019

Time: 08:30 - 10:00

Effect of spatially modulated magnetic field and spin-orbit coupling in Lieb lattice

Hong-Son Nguyen (1) and Minh-Tien Tran (2)

(1) Department of Occupational Safety and Health, Trade Union University, 169 Tay Son, Hanoi, Vietnam (2) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Hanoi, Vietnam

The interplay between the spin-orbit coupling and spatially modulated magnetic field in the Lieb lattice is studied by exact diagonalization. The spin-orbit coupling opens a gap in the single-particle spectra and leads to a topological insulator at third and two thirds fillings, whereas the magnetic field usually destroys the topology of the ground state. It is found at certain conditions of the spin-orbit coupling and the spatially modulated magnetic field the ground state is still paramagnetic and topological despite the presence of the magnetic field. The interplay between the spin-orbit coupling and the spatially modulated magnetic field leads to various exotic ground states.

Presenter: Nguyễn Hồng Sơn