Efficient Edelstein effects in one-atom-layer Tl-Pb compound

TL;DR

This study demonstrates efficient spin-charge conversion via Edelstein effects in a one-atom-layer Tl-Pb compound with large Rashba spin splitting, confirmed through spin pumping experiments at room temperature.

Contribution

First experimental observation of both direct and inverse Edelstein effects in a one-atom-layer Tl-Pb compound with large Rashba splitting.

Findings

Inverse Edelstein effect voltage observed in trilayer samples.

Edelstein length estimated to be ~0.1 nm.

Efficient spin-charge interconversion confirmed at room temperature.

Abstract

We have investigated direct and inverse Edelstein effects in a one-atom-layer Tl-Pb compound with a large Rashba-type spin splitting. In spin pumping experiments at room temperature, spin-to-charge conversion voltage due to the inverse Edelstein effect is clearly observed in Py/Cu/Tl-Pb trilayer samples. To confirm efficient spin-charge interconversion in Tl-Pb compounds, the direct Edelstein effect is also studied in the same trilayer samples by measuring modulation of the effective magnetization damping in the Py layer via the charge-to-spin conversion in the Tl-Pb layer. Using both the results of direct and inverse Edelstein effects, the Edelstein length is estimated to be ~0.1 nm for Tl-Pb compounds.