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Higher-order topological phase in 2-dimensional (2D) systems is characterizedby in-gap corner states, which are hard to detect and utilize. We numericallyinvestigate transport properties of topological corner states in 2D honeycomblattice, where the second-order topological phase is induced by an in-planeZeeman field in the conventional Kane-Mele model. Through engineeringmultihollow structures with appropriate boundaries in honeycomb lattice,multiple corner states emerge, which greatly increases the probability toobserve them. A typical two-probe setup is built to study the transportfeatures of a diamond-shaped system with multihollow structures. Numericalresults reveal the existence of global resonant states in bulk insulator, whichcorresponds to the resonant tunneling of multiple corner states and occupiesthe entire scattering region. Furthermore, based on the well separated energylevels of multiple corner states, a single-electron source is constructed.

Transport features of topological corner states in honeycomb lattice with multihollow structure