Unveiling the complete dispersion of the giant Rashba split surface states of ferroelectric α−GeTe(111) by alkali doping
- Kremer, Geoffroy Université de Fribourg
- Jaouen, Thomas Université de Fribourg
- Salzmann, Björn Université de Fribourg
- Nicolaï, L. Université de Fribourg
- Rumo, Maxime Université de Fribourg
- Nicholson, Christopher W. Université de Fribourg
- Hildebrand, Baptiste Université de Fribourg
- Dil, J. Hugo Ecole Polytechnique Fédérale de Lausanne
- Springholz, G. Johannes Kepler Universität
- Krempasky, Juraj Paul Scherrer Institut
- Monney, Claude Université de Fribourg
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2020
Published in:
- Physical Review Research. - 2020, vol. 2, no. 3, p. 033115
Ferroelectricity
Rashba coupling
Surface states
Angle-resolved photoemission spectroscopy
Density functional calculations
Scanning tunneling microscopy
English
α−GeTe(111) is a noncentrosymmetric ferroelectric material for which a strong spin- orbit interaction gives rise to giant Rashba split states in the bulk and at the surface. The detailed dispersions of the surface states inside the bulk band gap remains an open question because they are located in the unoccupied part of the electronic structure, making them inaccessible to static angle-resolved photoemission spectroscopy. We show that this difficulty can be overcome via in situ potassium doping of the surface, leading to a rigid shift of 80 meV of the surface states into the occupied states. Thus, we resolve, in great detail, their dispersion and highlight their crossing at the ... point, which, in comparison with density functional theory calculations, definitively confirms the Rashba mechanism.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 330883
- DOI 10.1103/PhysRevResearch.2.033115
- Persistent URL
- https://folia.unifr.ch/unifr/documents/309596
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