Strong and fragile topological Dirac semimetals with higher-order Fermi arcs.

ABSTRACT: Dirac and Weyl semimetals both exhibit arc-like surface states. However, whereas the surface Fermi arcs in Weyl semimetals are topological consequences of the Weyl points themselves, the surface Fermi arcs in Dirac semimetals are not directly related to the bulk Dirac points, raising the question of whether there exists a topological bulk-boundary correspondence for Dirac semimetals. In this work, we discover that strong and fragile topological Dirac semimetals exhibit one-dimensional (1D) higher-order hinge Fermi arcs (HOFAs) as universal, direct consequences of their bulk 3D Dirac points. To predict HOFAs coexisting with topological surface states in solid-state Dirac semimetals, we introduce and layer a spinful model of an s-d-hybridized quadrupole insulator (QI). We develop a rigorous

SUBMITTER: Wieder BJ 

PROVIDER: S-EPMC6994491 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature