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

Article

关键词: POLARIZATION;    MONOLAYER;    SILICENE;    MOS2;    TRANSITION;    GERMANENE;   

DOI  :  10.1103/PhysRevB.91.161401

来源: SCIE

【 摘 要 】

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-splitting 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.

【 授权许可】

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