Back to Search Start Over

Tunable Spin and Orbital Edelstein Effect at (111) LaAlO3/SrTiO3 Interface

Authors :
Mattia Trama
Vittorio Cataudella
Carmine Antonio Perroni
Francesco Romeo
Roberta Citro
Source :
Nanomaterials, Vol 12, Iss 14, p 2494 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Converting charge current into spin current is one of the main mechanisms exploited in spintronics. One prominent example is the Edelstein effect, namely, the generation of a magnetization in response to an external electric field, which can be realized in systems with lack of inversion symmetry. If a system has electrons with an orbital angular momentum character, an orbital magnetization can be generated by the applied electric field, giving rise to the so-called orbital Edelstein effect. Oxide heterostructures are the ideal platform for these effects due to the strong spin–orbit coupling and the lack of inversion symmetries. Beyond a gate-tunable spin Edelstein effect, we predict an orbital Edelstein effect an order of magnitude larger then the spin one at the (111) LaAlO3/SrTiO3 interface for very low and high fillings. We model the material as a bilayer of t2g orbitals using a tight-binding approach, whereas transport properties are obtained in the Boltzmann approach. We give an effective model at low filling, which explains the non-trivial behaviour of the Edelstein response, showing that the hybridization between the electronic bands crucially impacts the Edelstein susceptibility.

Details

Language :
English
ISSN :
20794991
Volume :
12
Issue :
14
Database :
Directory of Open Access Journals
Journal :
Nanomaterials
Publication Type :
Academic Journal
Accession number :
edsdoj.0155e21598854325a263ce8454e3f612
Document Type :
article
Full Text :
https://doi.org/10.3390/nano12142494