Theory Meets Experiment in Low-Dimensional Structures with Correlated Electrons
Prague, Czech Republic, July 1 – 4, 2019
GeTe(111): direct evidence of static displacive ferroelectric response coupled to fully spin polarized bulk states
Manipulating spin textures through electric fields is a timely issue due to the potential for applications in low power electronics. Recently, a novel class of ferroelectric materials combining ferroelectric order with Rashba type switching of spin textures at room temperatures [1-3] opened an intriguing route for a non-volatile static electrical control of the spin degrees of freedom. In this respect, GeTe(111) is a model system which appears to possess an extra bonus: fully spin-polarized bulk states. We extended the experimental verification of the ferroelectric switching of these fully spin-polarized states in spin and momentum-resolved ways  with operando x-ray photoelectron-diffraction experiments . We found that the ferroelectric response feature systematic displacive response with characteristic fatigue effects consistent with operando spin-resolved measurements , proving that static electric fields indeed couple to GeTe domain polarizations and thus to Rashba-type splitting.
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 J. Krempaský et al., Disentangling bulk and surface Rashba effects in ferroelectric α-GeTe, PRB 94, 205111 (2016).
 J. Krempaský et al., Operando imaging of all-electric spin texture manipulation in ferroelectric and multiferroic Rashba semiconductors, PRX 8, 021067 (2018).
 J. Krempaský et al., in preparation