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.
Di Sante, D., Stroppa, A., Barone, P., Whangbo, M., Picozzi, S. (2015). Emergence of ferroelectricity and spin-valley properties in two-dimensional honeycomb binary compounds. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 91(16), 161401-161401 [10.1103/PhysRevB.91.161401].
Emergence of ferroelectricity and spin-valley properties in two-dimensional honeycomb binary compounds
Di Sante, D.
Primo
Membro del Collaboration Group
;
2015
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-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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
