Spin to charge conversion at Rashba-split 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="bold">SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
 interfaces from resonant tunneling

To, Duy-Quang; Dang, Thi Huong; Vila, Laurent; Attané, Jean Philippe; Bibès, Manuel; Jaffrès, Henri

doi:10.1103/physrevresearch.3.043170

Cited by 8 publications

(5 citation statements)

References 45 publications

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“…The IEE has been observed in topological insulators 8 and heterostructures of heavy metals 2 , 9 and oxides 3 – 6 . Among these, the two-dimensional electron gas (2DEG) formed at interfaces between perovskite-oxide SrTiO 3 (STO) and other oxides, such as LaAlO 3 (LAO) 10 and AlO x 11 , is capable of efficient spin-to-charge current conversion 3 – 7 . Thus far, large values of conversion efficiency of the IEE, called the inverse Edelstein length λ IEE , of up to ~60 nm have been reported for AlO x /STO 6 .…”

Section: Introductionmentioning

confidence: 99%

Giant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer

et al. 2022

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The two-dimensional electron gas (2DEG) formed at interfaces between SrTiO3 (STO) and other oxide insulating layers is promising for use in efficient spin-charge conversion due to the large Rashba spin-orbit interaction (RSOI). However, these insulating layers on STO prevent the propagation of a spin current injected from an adjacent ferromagnetic layer. Moreover, the mechanism of the spin-current flow in these insulating layers is still unexplored. Here, using a strongly correlated polar-metal LaTiO3+δ (LTO) interlayer and the 2DEG formed at the LTO/STO interface in an all-epitaxial heterostructure, we demonstrate giant spin-to-charge current conversion efficiencies, up to ~190 nm, using spin-pumping ferromagnetic-resonance voltage measurements. This value is the highest among those reported for all materials, including spin Hall systems. Our results suggest that the strong on-site Coulomb repulsion in LTO and the giant RSOI of LTO/STO may be the key to efficient spin-charge conversion with suppressed spin-flip scattering. Our findings highlight the hidden inherent possibilities of oxide interfaces for spin-orbitronics applications.

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Section: Introductionmentioning

confidence: 99%

Giant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer

et al. 2022

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“…Such an investigation has been lacking even though there has been numerous studies conducted on spin accumulation and transport in the LaO/STO system [53][54][55][56][57]. A previous study on a LaO/STO 2DEG system with a finite thickness focused on the out-of-plane transmission instead of transport within the 2D plane [58]. To address the shortcomings in earlier derivations of effective low-energy Hamiltonians [34,59] for the LaO/STO 2DEG, Ho et al explicitly accounted for the spatial variation of the confining potential and the resultant quantum confinement [52] .…”

Section: Introductionmentioning

confidence: 99%

Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin-orbit couplings

2022

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The interaction between the linear and cubic spin-orbit coupling with magnetic moments and mobile spin-polarized carriers in the LaO/STO system provides new avenues for spin transport applications. We study the interplay between linear and cubic Rashba spin orbit coupling (RSOC) on in-plane magnetic moments in the LaO/STO system using the Boltzmann transport theory based on the relaxation time approximation (RTA) and the more refined Schliemann-Loss (SL) delta-potential scattering model. In general, both methods yield a linear (quadratic) relationship between the spin accumulation (spin current) when one of the three RSOC strengths is varied and the other two fixed. The simultaneous presence of multiple types of RSOC with distinct angular dependences is a key ingredient in breaking the k-space symmetry of the Fermi surface, thus ensuring a finite spin accumulation upon integration over the entire Fermi surface. While the oft-used RTA method is sufficiently accurate for spin accumulation calculations, the more refined SL model is required for spin current calculations because the RTA method neglects the anisotropy of the Fermi contour arising from the cubic RSOC terms. Based on the refined SL model and under optimal tuning of the RSOC parameters, the spin charge conversion values in LaO/STO is predicted to reach a remarkable efficiency of 30%.

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“…2: Mott skew scattering results from spin-momentum correlations induced by SOC when electrons impinge on impurities [8]. Similar correlations appear if electrons cross any scattering region with SOC, e.g., by tunneling through a spin-orbit-coupled barrier [24][25][26] or by entering from or landing into a region with SOC [28][29][30], leading to various spin-charge conversion channels. (a) SOC is present only in the barrier, where a tunneling ISHE takes place: the result-FIG.…”

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confidence: 98%

“…Recently, some tunneling spin Hall [25] and anomalous Hall effects were proposed [25,26], * cosimo.gorini@cea.fr arising from under-the-barrier transmission, which is not only spin-sensitive but also skewed in momentum space [27]. Skewedness actually appears also if SOC is present only on the injecting/receiving metallic sides [28][29][30], rather than only under the barrier [25]. As emphasized in Ref.…”

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confidence: 99%

“…As emphasized in Ref. [30], skewed injection is crucial in a novel spin-charge conversion platform rapidly on the rise: that of high-quality 2DEGs at oxide interfaces [31], whose fundamental and technological potential is beyond question [32][33][34]. Such systems can be easily manipulated via gates and are intrinsically inversion asymmetric, with more or less complex forms of Rashba SOC on the 2DEG side [33,35,36].…”

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confidence: 99%

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Tunneling anisotropic spin galvanic effect

2023

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We show that pure spin injection from a magnetic electrode into an inversion symmetry-broken system composed of a tunnel barrier and a metallic region generates a transverse charge current. Such a tunneling spin galvanic conversion is robust to disorder and nonlocal, i.e., injection and detection contacts do not coincide, and is strongly anisotropic whenever the internal spin-orbit field has a nontrivial angular dependence. The anisotropy shows up in linear response, contrary to what happens in bulk conversion setups lacking tunneling elements. This is particularly relevant for spin-charge conversion at oxide interfaces, where both the tunnel barrier and the receiving low-dimensional metallic system host effective spin-orbit fields with complex angular symmetries.

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Spin to charge conversion at Rashba-split SrTiO3 interfaces from resonant tunneling

Cited by 8 publications

References 45 publications

Giant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer

Giant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer

Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin-orbit couplings

Tunneling anisotropic spin galvanic effect

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