  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.
