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Gapped topological kink states and topological corner states in honeycomb lattice

Authors :
Yijia Wu
Xingwang Xie
Ziyuan Jia
Zhi Hong Hang
Rui-Chun Xiao
Hua Jiang
Yuting Yang
Source :
Science Bulletin. 65:531-537
Publication Year :
2020
Publisher :
Elsevier BV, 2020.

Abstract

Based on the tight-binding calculations on honeycomb lattice and photonic experimental visualization on artificial graphene (AG), we report the domain-wall-induced gapped topological kink states and topological corner states. In honeycomb lattice, domain walls (DWs) with gapless topological kink states could be induced either by sublattice symmetry breaking or by lattice deformation. We find that the coexistence of these two mechanisms will induce DWs with gapped topological kink states. Significantly, the intersection of these two types of DWs gives rise to topological corner state localized at the crossing point. Through the manipulation of the DWs, we show AG with honeycomb lattice structure not only a versatile platform supporting multiple topological corner modes in a controlled manner, but also possessing promising applications such as fabricating topological quantum dots composed of gapped topological kink states and topological corner states.

Details

ISSN :
20959273
Volume :
65
Database :
OpenAIRE
Journal :
Science Bulletin
Accession number :
edsair.doi...........eb40e2bc60eb3df27542c6ee7164d934
Full Text :
https://doi.org/10.1016/j.scib.2020.01.024