Publications by authors named "S D Stolwijk"
Rotatable spin-polarized electron source for inverse-photoemission experiments.
Rev Sci Instrum
January 2014
We present a ROtatable Spin-polarized Electron source (ROSE) for the use in spin- and angle-resolved inverse-photoemission (SR-IPE) experiments. A key feature of the ROSE is a variable direction of the transversal electron beam polarization. As a result, the inverse-photoemission experiment becomes sensitive to two orthogonal in-plane polarization directions, and, for nonnormal electron incidence, to the out-of-plane polarization component.
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- The study explores the electronic structure of the Tl/Si(111) surface using both experimental methods and theoretical calculations.
- It identifies a unique spin-orbit-split surface state, where the spin polarization direction changes as you move through the surface's symmetry points.
- A significant energy splitting of about 0.6 eV is noted, due to the localization of the unoccupied surface state near heavy Tl atoms, leading to out-of-plane spin-polarized valleys that help reduce backscattering.
Article Synopsis
- The addition of valley degrees of freedom to spin-polarized electronic systems can enhance the functionality of next-gen devices, but challenges in valley polarization have hindered progress.
- This research demonstrates a method to achieve 100% spin-polarized valleys using the Rashba effect in a system with C3 symmetry, significantly improving polarization compared to typical Rashba systems.
- The findings suggest that this new system, built on a silicon substrate, could lead to more efficient silicon-based spintronic devices by reducing spin-charge backscattering.