Journal
PHYSICAL REVIEW B
Volume 94, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.205111
Keywords
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Funding
- Swiss National Science Foundation [PP00P2_144742 1]
- German funding agency DFG [SPP1666, EB 154/32]
- German ministry BMBF [05K13WMA]
- Austrian Science Fund [P20 550-N20(IR-On)]
- CENTEM Project [CZ.1.05/2.1.00/03.0088]
- ERDF, Ministry of Education, Youth and Sports OP RDI programme
- Czech Science Foundation [14-08124S]
- European Community [290605]
- CENTEM PLUS [LO1402]
- COST [LD15147]
- Austrian Science Fund (FWF) [J 3523] Funding Source: researchfish
- Austrian Science Fund (FWF) [J3523] Funding Source: Austrian Science Fund (FWF)
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Macroscopic ferroelectric order in alpha-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 a-GeTe(111) semiconductor exhibiting a giant spin splitting with Rashba parameter alpha(R) around 4.2 eV angstrom, the highest of so-far known materials.
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