Abstract
We demonstrate efficient intrinsic spin-to-charge current conversion in a two-dimensional electron gas using an all-epitaxial single-crystal heterostructure of LaSrMnO3/ LaAlO3 (LAO)/ SrTiO3 (STO), which can suppress spin scattering and give us an ideal environment to investigate intrinsic spin-charge conversion. With decreasing temperature to 20 K, the spin-to-charge conversion efficiency is drastically enhanced to +3.9 nm, which is the largest positive value ever reported for LAO/STO. Our band-structure calculation well reproduces this behavior and predicts further enhancement by controlling the density and relaxation time of the carriers.
Highlights
We demonstrate efficient intrinsic spin-to-charge current conversion in a two-dimensional electron gas using an all-epitaxial single-crystal heterostructure of LaSrMnO3/LaAlO3/SrTiO3, which can suppress spin scattering and give us an ideal environment to investigate intrinsic spin-charge conversion
The Rashba spin-orbit interaction and resulting spin splitting of the Fermi surface appear due to the broken space-inversion symmetry, causing a spin-to-charge current conversion that is known as the inverse Edelstein effect (IEE) [10,11,12]
The strong Rashba spin-orbit interaction at LAO/STO, which can be modulated by a gate voltage, makes this system very attractive for controllable efficient spin-charge conversion [16,17,18]; previously reported results for spin-charge conversion at LAO/STO are divergent, which cannot be explained by the difference of the transport properties of the 2DEG, and a unified understanding of the intrinsic mechanism of the spin-charge conversion is still lacking [13,19,20,21]
Summary
We demonstrate efficient intrinsic spin-to-charge current conversion in a two-dimensional electron gas using an all-epitaxial single-crystal heterostructure of LaSrMnO3/LaAlO3/SrTiO3, which can suppress spin scattering and give us an ideal environment to investigate intrinsic spin-charge conversion. Efficient intrinsic spin-to-charge current conversion in an all-epitaxial single-crystal perovskite-oxide heterostructure of La0.67Sr0.33MnO3/LaAlO3/SrTiO3 With decreasing temperature to 20 K, the spin-to-charge conversion efficiency is drastically enhanced to +6.7 nm.
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