Spin-Dependent High-Order Topological Insulator and Two Types of Distinct Corner Modes in Monolayer FeSe/GdClO Heterostructure

• DOI: 10.48550/arxiv.2210.11813
• Publication Date: 2022-01-01
• Authors: Qing Wang; Rui Song; Hao Ning
• Keywords: Topological insulator; Spin–orbit interaction

We propose that a spin-dependent second-order topological insulator can be realized in monolayer FeSe/GdClO heterostructure, which substrate GdClO helps to stabilize and enhance the antiferromagnetic order FeSe. The is free from spin-orbit coupling in-plane magnetic field. also find there exist two types of distinct corner modes residing intersections ferromagnetic edges edges, respectively. underlying physics for mode follows sublattice-chirality-kink picture. More interestingly, shows property, robust against coupling. Unexpectedly, taken as typical emergent hierarchical phenomenon an array modes. Remarkably, violate general kink picture understood bound states one-dimensional Schrodinger equation under connected potential well. Our findings not only provide promising electronic materials, but uncover some new properties high-order insulator.