Emergence of ferroelectricity and spin-valley properties in two-dimensional honeycomb binary compounds

Abstract

By means of density functional theory calculations, we predict that several two dimensional AB binary monolayers, where A and B atoms belong to group IV or III-V, are ferroelectric. Dipoles arise from the buckled structure, where the A and B ions are located on the sites of a bipartite corrugated honeycomb lattice with trigonal symmetry. We discuss the emerging valley-dependent properties and the coupling of spin and valley physics, which arise from the loss of inversion symmetry, and explore the interplay between ferroelectricity and Rashba spin-spitting phenomena. We show that valley-related properties originate mainly from the binary nature of AB monolayers, while the Rashba spin-texture developing around valleys is fully controllable and switchable by reversing the ferroelectric polarization.

References in corpus (8)

• The electronic properties of graphene
• Valley polarization in MoS2 monolayers by optical pumping
• The Valley Hall Effect in MoS2 Transistors
• Valley filter and valley valve in graphene
• Germanene: a novel two-dimensional Germanium allotrope akin to Graphene and Silicene
• Spin-Valleytronics in Silicene: Quantum-Spin-Quantum-Anomalous Hall Insulators and Single-Valley Semimetals
• Absence of Critical Thickness in an Ultrathin Improper Ferroelectric Film
• Robustness against Disorder of Relativistic Spectral Properties in Chalcogenide Alloys

Cited by in corpus (11)

• Type-II multiferroic Hf${}_2$VC${}_2$F${}_2$ MXene monolayer with high transition temperature
• Two-Dimensional Hyperferroelectric Metals: a Different Route to Ferromagnetic-Ferroelectric Multiferroics
• Modulated Interlayer Exciton Properties in a Two-Dimensional Moire Crystal
• Tunable magnetism in ferroelectric α-In2Se3 by hole-doping
• Two-dimensional Square Buckled Rashba Lead Chalcogenides
• Quasiparticle band structures, spontaneous polarization, and spin-splitting in noncentrosymmetric few-layer and bulk $\gamma$-GeSe
• Reversible giant out-of-plane Rashba effect in two-dimensional Ga$XY$ ($X$= Se, Te; $Y$= Cl, Br, I) compounds for persistent spin helix
• Strain-tunable in-plane ferroelectricity and lateral tunnel junction in monolayer group-IV monochalcogenides
• Topological Phase Transition Coupled with Spin-Valley Physics in Ferroelectric Oxide Heterostructures
• Structural distortions in monolayers of binary semiconductors
• Two-dimensional multiferroic NbPc COF with strong magnetoelectric coupling and room-temperature ferroelectricity