4:00 PM - 6:00 PM
△ [17p-P10-9] The Fermi Arcs in Topological Insulator Superlattice
Keywords:Weyl semimetals, Fermi arcs, Topological insulators
Recently Weyl semimetals attract much attention all over the world. They do not preserve the time reversal symmetry or the inversion symmetry. As a result, degenerate Dirac nodes split into pairs of Weyl points in these semimetals. Weyl point has +1 or -1 chirality. Therefore, each Weyl point has two different types of chiralities. Weyl semimetals have topologically protected surface states. A Fermi arc connecting a pair of Weyl points emerges in the Fermi surface of the surface states. The existence of Fermi arcs is one of the important properties of Weyl semimetals.
In 2011, A. A. Bulkov and L. Balents suggested that multi-layers structure using topological insulators/insulators superlattice shows the Weyl semimetal phase in the case that the topological insulators have magnetic impurities. This system violates the time reversal symmetry because of this magnetization. The direction of magnetization of these impurities is considered to be perpendicular to the topological insulator surface. In this research, we convert this model to the discrete system in the parallel direction to the surface of topological insulators. We perform the calculations of energy band dispersions in both the continuous and discrete systems in the Weyl semimetal phase. As a result, we can calculate the surface states and show the Fermi arcs in the discrete system. We can also make sure that the Fermi arc connects the two Weyl nodes in this discrete model.
Recently, many people have investigated the Weyl semimetal. However, the actual numerical calculations of this Fermi arc are not so much performed. Therefore, we believe that this research is important for investigating the surface states of the Weyl semimetals. In the poster, we will also discuss the case that the topological insulators superlattice has different magnetic direction such as staggered direction.
In 2011, A. A. Bulkov and L. Balents suggested that multi-layers structure using topological insulators/insulators superlattice shows the Weyl semimetal phase in the case that the topological insulators have magnetic impurities. This system violates the time reversal symmetry because of this magnetization. The direction of magnetization of these impurities is considered to be perpendicular to the topological insulator surface. In this research, we convert this model to the discrete system in the parallel direction to the surface of topological insulators. We perform the calculations of energy band dispersions in both the continuous and discrete systems in the Weyl semimetal phase. As a result, we can calculate the surface states and show the Fermi arcs in the discrete system. We can also make sure that the Fermi arc connects the two Weyl nodes in this discrete model.
Recently, many people have investigated the Weyl semimetal. However, the actual numerical calculations of this Fermi arc are not so much performed. Therefore, we believe that this research is important for investigating the surface states of the Weyl semimetals. In the poster, we will also discuss the case that the topological insulators superlattice has different magnetic direction such as staggered direction.