Possibility of regulating valley-contrasting physics and topological properties by ferroelectricity in functionalized arsenene

Abstract

Two-dimensional (2D) multifunctional material, which couples multiple physical properties together, is both fundamentally intriguing and practically appealing. Here, based on first-principles calculations and tight-binding (TB) model analysis, the possibility of...

Tunable valley polarization effect and second-order topological state in monolayer FeClSH

“…Second-order topological insulators (SOTIs) have received recent interest. 25,26 Different from traditional topological insulators, [27][28][29] SOTIs are characterized by lower-dimensional protected boundary states. For example, three-dimensional (3D) SOTIs have one-dimensional (1D) gapless states along their hinges, and 2D SOTIs display topological gapless states at its zero-dimensional (0D) corners between the corresponding gapped edges.…”