Title:	Unveiling the complete dispersion of the giant Rashba split surface states of ferroelectric α-GeTe(111) by alkali doping
Authors:	Kremer, G. Jaouen, T. Salzmann, B. Nicolai, Laurent Christophe Rumo, M. Nicholson, C. W. Hildebrand, B. Dil, J. H. Minár, Jan Springholz, G. Krempaský, J. Monney, C.
Citation:	KREMER, G. JAOUEN, T. SALZMANN, B. NICOLAI, LCH. RUMO, M. NICHOLSON, CW. HILDEBRAND, B. DIL, JH. MINÁR, J. SPRINGHOLZ, G. KREMPASKÝ, J. MONNEY, C. Unveiling the complete dispersion of the giant Rashba split surface states of ferroelectric α-GeTe(111) by alkali doping. Physical Review Research, 2020, roč. 2, č. 3, s. nestránkováno. ISSN: 2643-1564
Issue Date:	2020
Publisher:	American Physical Society
Document type:	článek article
URI:	2-s2.0-85099665402 http://hdl.handle.net/11025/45548
ISSN:	2643-1564
Keywords in different language:	Photoemission;electronic structue;GeTe;K dopping
Abstract in different language:	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
Rights:	© Creative Commons Attribution 4.0 International
Appears in Collections:	Články / Articles (RAM) OBD

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