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 ...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.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12174262 and 11774238)the Natural Science Foundation of Guangdong(Grant No.2020A1515011418)the Natural Science Foundation of Shenzhen(Grant Nos.20200812092737002,JCYJ20190808150409413,JCYJ20190808115415679,and JCYJ20190808152801642).
文摘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.
