Topological excitonic corner states and nodal phase in bilayer quantum spin Hall insulators
Abstract
Interaction induced topological states remain one of the fascinating phases in condensed matter physics. The exciton condensate has recently sparked renewed interest due to the discovery of new candidate materials and its driving force to realize exotic topological states. In this work, we explore the exciton orders induced high-order topology in the bilayer quantum spin Hall insulators and find that the topological excitonic corner states can be realized by tuning the gate and magnetic field. When an in-plane Zeeman field is applied to the system, two or four excitonic boundary-obstructed corner states emerge in the bilayer system for distinct possible -wave excitonic pairings. Besides, we also find a two-dimensional excitonic Weyl nodal phase, which supports flat band edge states connecting the bulk Weyl nodes.
Keywords
Cite
@article{arxiv.2101.00923,
title = {Topological excitonic corner states and nodal phase in bilayer quantum spin Hall insulators},
author = {Zheng-Rong Liu and Lun-Hui Hu and Chui-Zhen Chen and Bin Zhou and Dong-Hui Xu},
journal= {arXiv preprint arXiv:2101.00923},
year = {2021}
}
Comments
4+ pages, 4 figures, 4+ pages of supplemental materials, accepted by Phys. Rev. B as a Letter