Spin Mapping of Surface and Bulk Rashba States in Ferroelectric a-GeTe(111) Films
H. J. Elmers, R. Wallauer, M. Liebmann, J. Kellner, M. Morgenstern,, R.N. Wang, J.E. Boschker, R. Calarco, O. Rader, D. Kutnyakhov, S.V. Chernov,, K. Medjanik, C. Tusche, M. Ellguth, H. Volfova, J. Braun, J. Minar, H. Ebert,, and G. Schonhense
TL;DR
This study maps the spin polarization of surface and bulk Rashba states in ferroelectric a-GeTe(111) films, revealing complex spin textures and potential for spintronic device applications.
Contribution
It provides a comprehensive spin mapping of both surface and bulk Rashba states in ferroelectric a-GeTe(111) films using advanced momentum microscopy.
Findings
Rashba splitting observed in surface and bulk bands
Opposite spin helicity in inner and outer Rashba bands
Complex spin texture at the Fermi energy
Abstract
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.
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