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Article Dans Une Revue Advanced Materials Année : 2021

Spin–Charge Interconversion in KTaO 3 2D Electron Gases

Julien Bréhin
  • Fonction : Auteur
Raphaël Salazar
  • Fonction : Auteur
Paul Noël
Suvam Bhattacharya
  • Fonction : Auteur
Patrick Le Fèvre
François Bertran
Guilhem Saiz
  • Fonction : Auteur
Gerbold Ménard
  • Fonction : Auteur
Nicolas Bergeal
  • Fonction : Auteur
Hai Li
  • Fonction : Auteur
Chia-Ching Lin
  • Fonction : Auteur
Dmitri E. Nikonov
  • Fonction : Auteur
Ian A. Young
  • Fonction : Auteur
Julien Rault
Laurent Vila

Résumé

Oxide interfaces exhibit a broad range of physical effects stemming from broken inversion symmetry. In particular, they can display non-reciprocal phenomena when time reversal symmetry is also broken, e.g., by the application of a magnetic field. Examples include the direct and inverse Edelstein effects (DEE, IEE) that allow the interconversion between spin currents and charge currents. The DEE and IEE have been investigated in interfaces based on the perovskite SrTiO$_3$ (STO), albeit in separate studies focusing on one or the other. The demonstration of these effects remains mostly elusive in other oxide interface systems despite their blossoming in the last decade. Here, we report the observation of both the DEE and IEE in a new interfacial two-dimensional electron gas (2DEG) based on the perovskite oxide KTaO$_3$. We generate 2DEGs by the simple deposition of Al metal onto KTaO$_3$ single crystals, characterize them by angle-resolved photoemission spectroscopy and magnetotransport, and demonstrate the DEE through unidirectional magnetoresistance and the IEE by spin-pumping experiments. We compare the spin-charge interconversion efficiency with that of STO-based interfaces, relate it to the 2DEG electronic structure, and give perspectives for the implementation of KTaO$_3$ 2DEGs into spin-orbitronic devices.

Dates et versions

hal-03768234 , version 1 (02-09-2022)

Identifiants

Citer

Luis M. Vicente-Arche, Julien Bréhin, Sara Varotto, Maxen Cosset-Cheneau, Srijani Mallik, et al.. Spin–Charge Interconversion in KTaO 3 2D Electron Gases. Advanced Materials, 2021, 33 (43), pp.2102102. ⟨10.1002/adma.202102102⟩. ⟨hal-03768234⟩
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