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"Disentangling bulk and surface Rashba effects in ferroelectric α-GeTe
" J. Krempasky, H. Volfova, S. Muff, N. Pilet, G. Landolt, M. Radovic, M. Shi, D. Kriegner, V. Holy, J. Braun, H. Ebert, F. Bisti, V. A. Rogalev, V. N. Strocov, G. Springholz, J. Minar, and J. H. DilPhys. Rev. B 94, 205111, (2016) Abstract: Macroscopic ferroelectric order in α-GeTe with its noncentrosymmetric lattice structure leads to a giant Rashba spin splitting in the bulk bands due to strong spin-orbit interaction. Direct measurements of the bulk band structure using soft x-ray angle-resolved photoemission (ARPES) reveals the three-dimensional electronic structure with spindle torus shape. By combining high-resolution and spin-resolved ARPES as well as photoemission calculations, the bulk electronic structure is disentangled from the two-dimensional surface electronic structure by means of surface capping, which quenches the complex surface electronic structure. This unravels the bulk Rashba-split states in the ferroelectric Rashba α-GeTe(111) semiconductor exhibiting a giant spin splitting with Rashba parameter &alpha R around 4.2 eV Å, the highest of so-far known materials. This publication has not been written at BMO BMO authors (in alphabetic order): Henrieta Derondeau  WWW-Version DOI-Version |