A comprehensive mapping of the spin polarization of the electronic bands in ferroelectric a-GeTe(111) films has been performed using a time-of-flight momentum microscope equipped with an imaging spin filter that enables a simultaneous measurement of more than 10.000 data points (voxels). A Rashba type splitting of both surface and bulk bands with opposite spin helicity of the inner and outer Rashba bands is found revealing a complex spin texture at the Fermi energy. The switchable inner electric field of GeTe implies new functionalities for spintronic devices.
@article{arxiv.1512.01363,
title = {Spin Mapping of Surface and Bulk Rashba States in Ferroelectric a-GeTe(111) Films},
author = {H. J. Elmers and R. Wallauer and M. Liebmann and J. Kellner and M. Morgenstern and R. N. Wang and J. E. Boschker and R. Calarco and O. Rader and D. Kutnyakhov and S. V. Chernov and K. Medjanik and C. Tusche and M. Ellguth and H. Volfova and J. Braun and J. Minar and H. Ebert and G. Schonhense},
journal= {arXiv preprint arXiv:1512.01363},
year = {2016}
}