title: Intertwined Rashba, Dirac, and Weyl Fermions in Hexagonal Hyperferroelectrics.
abstract: By means of density functional theory based calculations, we study the role of spin-orbit coupling in the new family of ABC hyperferroelectrics [Garrity, Rabe, and Vanderbilt Phys. Rev. Lett. 112, 127601 (2014)]. We unveil an extremely rich physics strongly linked to ferroelectric properties, ranging from the electric control of bulk Rashba effect to the existence of a three-dimensional topological insulator phase, with concomitant topological surface states even in the ultrathin film limit. Moreover, we predict that the topological transition, as induced by alloying, is followed by a Weyl semimetal phase of finite concentration extension, which is robust against disorder, putting forward hyperferroelectrics as promising candidates for spin-orbitronic applications.
authors: Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland Campus Süd, Würzburg 97074, Germany.|Consiglio Nazionale delle Ricerche (CNR-SPIN), Via Vetoio, L'Aquila 67100, Italy.
authors: Domenico
authors: D
authors: Di Sante
authors: Consiglio Nazionale delle Ricerche (CNR-SPIN), Via Vetoio, L'Aquila 67100, Italy.|Graphene Labs, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy.
authors: Paolo
authors: P
authors: Barone
authors: Consiglio Nazionale delle Ricerche (CNR-SPIN), Via Vetoio, L'Aquila 67100, Italy.
authors: Alessandro
authors: A
authors: Stroppa
authors: Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg Maryland, 20899, USA.
authors: Kevin F
authors: KF
authors: Garrity
authors: Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
authors: David
authors: D
authors: Vanderbilt
authors: Consiglio Nazionale delle Ricerche (CNR-SPIN), Via Vetoio, L'Aquila 67100, Italy.
authors: Silvia
authors: S
authors: Picozzi