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Disentangling bulk and surface Rashba effects in ferroelectric α-GeTe

Citace:
KREMPASKÝ, J., VOLFOVÁ, H., MUFF, S., PILET, N., LANDOLT, G., RADOVIĆ, M., SHI, M., KRIEGNER, D., HOLÝ, V., BRAUN, J. W., EBERT, H., BISTI, F., ROGALEV, V. A., STROCOV, V. N., SPRINGHOLZ, G., MINÁR, J., DIL, J. H. Disentangling bulk and surface Rashba effects in ferroelectric ?-GeTe. PHYSICAL REVIEW B, 2016, roč. 94, č. 20, s. 2051111-2051117. ISSN: 2469-9950
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: Disentangling bulk and surface Rashba effects in ferroelectric ?-GeTe
Rok vydání: 2016
Autoři: J. Krempaský , H. Volfová , Stefan Muff , Nicolas Pilet , Gabriel Landolt , M. Radović , Ming Shi , Dominik Kriegner , Václav Holý , Jürgen W. Braun , Hubert Ebert , Federico Bisti , V. A. Rogalev , Vladimir N. Strocov , Gunther Springholz , Doc.Dr. Jan Minár , Jan Hugo Dil
Abstrakt CZ: Identifikace bulkových a povrchových Rashba stavů v ferroelektrickém GeTe
Abstrakt EN: Macroscopic ferroelectric order in ?-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 ?-GeTe(111) semiconductor exhibiting a giant spin splitting with Rashba parameter ?R around 4.2 eV A?, the highest of so-far known materials.
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