Rationalizing and engineering Rashba spin-splitting in ferroelectric oxides

Djani-Ait, Hania; García Castro, Andrès Camilo; Tong, Wenyi; Barone, Paolo; Bousquet, Eric; Picozzi, Silvia; Ghosez, Philippe

doi:10.1038/s41535-019-0190-z

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Rationalizing and engineering Rashba spin-splitting in ferroelectric oxides

Djani-Ait, Hania; García Castro, Andrès Camilo; Tong, Wenyi et al.

2019 • In npj Quantum Materials, 4, p. 51

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10.1038/s41535-019-0190-z

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Keywords :

Ferroelectric; Rashba; spintronic

Abstract :

[en] Ferroelectric Rashba semiconductors (FERSC), in which Rashba spin-splitting can be controlled and reversed by an electric field, have recently emerged as a new class of functional materials useful for spintronic applications. The development of concrete devices based on such materials is, however, still hampered by the lack of robust FERSC compounds. Here, we show that the coexistence of large spontaneous polarization and sizeable spin–orbit coupling is not sufficient to have strong Rashba effects and clarify why simple ferroelectric oxide perovskites with transition metal at the B-site are typically not suitable FERSC candidates. By rationalizing how this limitation can be by-passed through band engineering of the electronic structure in layered perovskites, we identify the Bi2WO6 Aurivillius crystal as a robust ferroelectric with large and reversible Rashba spin-splitting, that can even be substantially doped without losing its ferroelectric properties. Importantly, we highlight that a unidirectional spin–orbit field arises in layered Bi2WO6, resulting in a protection against spin-decoherence.

Research Center/Unit :

PhyTheMa

Disciplines :

Physics

Author, co-author :

Djani-Ait, Hania ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

García Castro, Andrès Camilo ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Tong, Wenyi ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Barone, Paolo; Consiglio Nazionale delle Ricerche (CNR-SPIN)

Bousquet, Eric ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Picozzi, Silvia; Consiglio Nazionale delle Ricerche (CNR-SPIN)

Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Language :

English

Title :

Rationalizing and engineering Rashba spin-splitting in ferroelectric oxides

Publication date :

2019

Journal title :

npj Quantum Materials

eISSN :

2397-4648

Publisher :

Nature Publishing Group, London, United Kingdom

Volume :

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Tags :

CÉCI : Consortium des Équipements de Calcul Intensif
Tier-1 supercomputer

Additional URL :

https://www.nature.com/articles/s41535-019-0190-z

Funding text :

Consortium des Equipements de Calcul Intensif (CECI), funded by the F.R.S.-FNRS under the Grant No. 2.5020.11 and theTier-1 supercomputer of the Fédération Wallonie-Bruxelles funded by the Walloon Region under the Grant No. 1117545.

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since 16 January 2020

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