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

Vaz, Diogo C.
Noël, Paul
Johansson, Annika
Göbel, Börge
Singh, Gyanendra
Trier, Felix
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Published in Nature materials. 2019
Abstract 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 pic- ture 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 inter- face-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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Other version: http://www.nature.com/articles/s41563-019-0467-4
Research group Groupe Baumberger
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VAZ, Diogo C. et al. Mapping spin–charge conversion to the band structure in a topological oxide two-dimensional electron gas. In: Nature Materials, 2019. doi: 10.1038/s41563-019-0467-4 https://archive-ouverte.unige.ch/unige:123136

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Deposited on : 2019-09-13

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