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arXiv · 1412.8675

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

Domenico Di Sante·Alessandro Stroppa·Paolo Barone·Myung-Hwan Whangbo·Silvia Picozzi
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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.

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Domenico Di Sante, Alessandro Stroppa, Paolo Barone, Myung-Hwan Whangbo, Silvia Picozzi. 2014-12-30. Emergence of ferroelectricity and spin-valley properties in two-dimensional honeycomb binary compounds. https://doi.org/10.1103/physrevb.91.161401

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