Disentangling bulk and surface Rashba effects in ferroelectric α-GeTe

J. Krempaský, H. Volfová, S. Muff, N. Pilet, G. Landolt, M. Radović, M. Shi, D. Kriegner, V. Holý, J. Braun, H. Ebert, F. Bisti, V. A. Rogalev, V. N. Strocov, G. Springholz, J. Minár, and J. H. Dil
Phys. Rev. B 94, 205111 – Published 7 November 2016
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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 αR around 4.2 eV Å, the highest of so-far known materials.

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  • Received 25 May 2016
  • Revised 5 October 2016

DOI:https://doi.org/10.1103/PhysRevB.94.205111

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. Krempaský1, H. Volfová2, S. Muff1,3, N. Pilet1, G. Landolt1,4, M. Radović1,5, M. Shi1, D. Kriegner6, V. Holý6, J. Braun2, H. Ebert2, F. Bisti1, V. A. Rogalev1, V. N. Strocov1, G. Springholz7, J. Minár2,8, and J. H. Dil1,3

  • 1Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 2Department of Chemistry, Ludwig Maximillian University, 81377 Munich, Germany
  • 3Institute of physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
  • 4Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
  • 5SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 6Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech Republic
  • 7Institut für Halbleiter-und Festkörperphysik, Johannes Kepler Universität, A-4040 Linz, Austria
  • 8New Technologies-Research Center University of West Bohemia, Plzeň, Czech Republic

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Issue

Vol. 94, Iss. 20 — 15 November 2016

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