Designing spin and orbital sources of Berry curvature at oxide interfaces

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...

Full description

Saved in:
Bibliographic Details
Published in:Nature materials 2023-05, Vol.22 (5), p.576-582
Main Authors: Lesne, Edouard, Saǧlam, Yildiz G., Battilomo, Raffaele, Mercaldo, Maria Teresa, van Thiel, Thierry C., Filippozzi, Ulderico, Noce, Canio, Cuoco, Mario, Steele, Gary A., Ortix, Carmine, Caviglia, Andrea D.
Format: Article
Language:English
Subjects:
639/766/119/544
639/766/119/995
Biomaterials
Chemistry and Materials Science
Condensed Matter Physics
Curvature
Dipoles
Electromagnetism
Electron spin
Electron states
Hall effect
Materials Science
Nanotechnology
Optical and Electronic Materials
Optoelectronics
Quantum numbers
Strontium titanates
Tensors
Wave functions
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. We report both spin- and orbital-sourced Berry curvature in LaAlO 3 /SrTiO 3 interfaces grown along the [111] direction.
ISSN:1476-1122
1476-4660
DOI:10.1038/s41563-023-01498-0