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Mapping spin-charge conversion to the band structure in a topological oxide two-dimensional electron gas.

  • Vaz DC Unité Mixte de Physique CNRS/Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France.
  • Noël P Université Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-Spintec, Grenoble, France.
  • Johansson A Max Planck Institute of Microstructure Physics, Halle, Germany.
  • Göbel B Max Planck Institute of Microstructure Physics, Halle, Germany.
  • Bruno FY Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland.
  • Singh G Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France.
  • McKeown-Walker S Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland.
  • Trier F Unité Mixte de Physique CNRS/Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France.
  • Vicente-Arche LM Unité Mixte de Physique CNRS/Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France.
  • Sander A Unité Mixte de Physique CNRS/Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France.
  • Valencia S Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany.
  • Bruneel P Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay, France.
  • Vivek M Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay, France.
  • Gabay M Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay, France.
  • Bergeal N Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, Paris, France.
  • Baumberger F Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland.
  • Okuno H Université Grenoble Alpes, CEA, IRIG-MEM, Grenoble, France.
  • Barthélémy A Unité Mixte de Physique CNRS/Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France.
  • Fert A Unité Mixte de Physique CNRS/Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France.
  • Vila L Université Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-Spintec, Grenoble, France. laurent.vila@cea.fr.
  • Mertig I Max Planck Institute of Microstructure Physics, Halle, Germany.
  • Attané JP Université Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-Spintec, Grenoble, France.
  • Bibes M Unité Mixte de Physique CNRS/Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France. manuel.bibes@cnrs-thales.fr.
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  • 2019-09-11
Published in:
  • Nature materials. - 2019
Mechanical Engineering
General Materials Science
Mechanics of Materials
General Chemistry
Condensed Matter Physics
English While spintronics has traditionally relied on ferromagnetic metals as spin generators and detectors, spin-orbitronics exploits the efficient spin-charge interconversion enabled by spin-orbit coupling in non-magnetic systems. Although the Rashba picture of split parabolic bands is often used to interpret such experiments, it fails to explain the largest conversion effects and their relationship with the electronic structure. Here, we demonstrate a very large spin-to-charge conversion effect in an interface-engineered, high-carrier-density SrTiO3 two-dimensional electron gas and map its gate dependence on the band structure. We show that the conversion process is amplified by enhanced Rashba-like splitting due to orbital mixing and in the vicinity of avoided band crossings with topologically non-trivial order. Our results indicate that oxide two-dimensional electron gases are strong candidates for spin-based information readout in new memory and transistor designs. Our results also emphasize the promise of topology as a new ingredient to expand the scope of complex oxides for spintronics.
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  • English
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green
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https://sonar.ch/global/documents/169532
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