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

Domenico Di Sante, Alessandro Stroppa, Paolo Barone, Myung-Hwan Whangbo, and Silvia Picozzi
Phys. Rev. B 91, 161401(R) – Published 6 April 2015
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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-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.

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  • Received 2 January 2015
  • Revised 11 February 2015

DOI:https://doi.org/10.1103/PhysRevB.91.161401

©2015 American Physical Society

Authors & Affiliations

Domenico Di Sante1,2,*, Alessandro Stroppa1,†, Paolo Barone1, Myung-Hwan Whangbo3, and Silvia Picozzi1

  • 1Consiglio Nazionale delle Ricerche (CNR-SPIN), Via Vetoio, I-67010 L'Aquila, Italy
  • 2Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio 10, I-67010 L'Aquila, Italy
  • 3Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA

  • *domenico.disante@spin.cnr.it
  • alessandro.stroppa@aquila.infn.it

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Issue

Vol. 91, Iss. 16 — 15 April 2015

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