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Designing spin and orbital sources of Berry curvature at oxide interfaces

Publié dansNature materials
Date de publication2023-03-16
Date de mise en ligne2023-03-16
Résumé

Quantum materials can display physical phenomena rooted in the geometry of electronic wavefunctions. The corresponding geometric tensor is characterized by an emergent field known as the Berry curvature (BC). Large BCs typically arise when electronic states with different spin, orbital or sublattice quantum numbers hybridize at finite crystal momentum. In all the materials known to date, the BC is triggered by the hybridization of a single type of quantum number. Here we report the discovery of the first material system having both spin- and orbital-sourced BC: LaAlO 3 /SrTiO 3 interfaces grown along the [111] direction. We independently detect these two sources and probe the BC associated to the spin quantum number through the measurements of an anomalous planar Hall effect. The observation of a nonlinear Hall effect with time-reversal symmetry signals large orbital-mediated BC dipoles. The coexistence of different forms of BC enables the combination of spintronic and optoelectronic functionalities in a single material.

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Citation (format ISO)
LESNE, Edouard et al. Designing spin and orbital sources of Berry curvature at oxide interfaces. In: Nature materials, 2023. doi: 10.1038/s41563-023-01498-0
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Article (Published version)
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ISSN du journal1476-1122
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Informations techniques

Création14/04/2023 13:05:32
Première validation19/04/2023 11:40:51
Heure de mise à jour19/04/2023 11:40:51
Changement de statut19/04/2023 11:40:51
Dernière indexation06/05/2024 15:44:51
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