Transport features of topological corner states in honeycomb lattice with multihollow structure
Kai-Tong Wang1,2, Fuming Xu2(), Bin Wang2, Yunjin Yu2, Yadong Wei2
1. School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China 2. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Higher-order topological phase in 2-dimensional (2D) systems is characterized by in-gap corner states, which are hard to detect and utilize. We numerically investigate transport properties of topological corner states in 2D honeycomb lattice, where the second-order topological phase is induced by an in-plane Zeeman field in the conventional Kane–Mele model. Through engineering multihollow structures with appropriate boundaries in honeycomb lattice, multiple corner states emerge, which greatly increases the probability to observe them. A typical two-probe setup is built to study the transport features of a diamond-shaped system with multihollow structures. Numerical results reveal the existence of global resonant states in bulk insulator, which corresponds to the resonant tunneling of multiple corner states and occupies the entire scattering region. Furthermore, based on the well separated energy levels of multiple corner states, a single-electron source is constructed.
. [J]. Frontiers of Physics, 2022, 17(4): 43501.
Kai-Tong Wang, Fuming Xu, Bin Wang, Yunjin Yu, Yadong Wei. Transport features of topological corner states in honeycomb lattice with multihollow structure. Front. Phys. , 2022, 17(4): 43501.
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