[Phases topologiques induites par intrication des composantes orbitales aux interfaces d’oxydes de métaux de transition]
En dépit de l’apparente simplicité de leur structure cristallographique, les perovskites de métaux de transition présentent une grande richesse et complexité de phases électroniques, magnétiques et structurales. L’existence de différents types de défauts, de rotations et déformations des octaèdres oxygène-ion de transition expliquent en partie ce phénomène. De plus, le caractère d des fonctions d’ondes de l’ion de transition introduit un degré de liberté supplémentaire, susceptible de mener à l’intrication des fonctions d’onde du composé. Ceci confère à ces matériaux des propriétés topologiques en dimension réduite. Nous présentons ici quelques unes des caractéristiques topologiques aux interfaces et surfaces d’hétérostructures de certaines perovskites, lorsque la croissance est effectuée selon les orientations (001) et (111). Contrairement au cas très étudié des isolants topologiques, la topologie se manifeste dans le régime métallique, avec pour conséquence un réel potentiel sur le plan de l’ingénierie spintronique et du calcul quantique. Nous concluons par un hommage personnel à la mémoire de Gérard Toulouse.
The deceptively simple crystallographic structure of early transition metal oxide perovskites belies the complexity and variety of electronic, magnetic and structural phases that they display. Structural defects, rotations, tilts, deformations of the oxygen-transition metal element octahedra help explain many of these phenomena. Another key player is the orbital degree of freedom of the d-ion. It may lead to a quantum entanglement of the materials electronic wavefunctions which promotes topological states in low dimensional geometries. In this report we present a study of select topological properties at surfaces or heterostructure interfaces of a subset of these perovskites when the orientation of the structure is along the (001) or (111) direction. In contrast to the extensively studied classes of topological insulators, topology in these systems is a characteristic property of the conducting regime, thus endowing the compounds with potential spintronic and quantum computing functionalities. We conclude this communication with a personal tribute to Gérard Toulouse (in French).
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Mots-clés : Science des matériaux, Théorie, Perovskites, Interfaces, Topologie, Spintronique
Marc Gabay 1
CC-BY 4.0
@article{CRPHYS_2024__25_G1_303_0,
author = {Marc Gabay},
title = {Topological phases driven by orbital entanglement in {Transition} {Metal} {Oxide} {Perovskite} interfaces},
journal = {Comptes Rendus. Physique},
pages = {303--327},
publisher = {Acad\'emie des sciences, Paris},
volume = {25},
year = {2024},
doi = {10.5802/crphys.190},
language = {en},
}
Marc Gabay. Topological phases driven by orbital entanglement in Transition Metal Oxide Perovskite interfaces. Comptes Rendus. Physique, Volume 25 (2024), pp. 303-327. doi : 10.5802/crphys.190. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.190/
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