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Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 73: Electronic Structure of Surfaces 1

O 73.6: Talk

Thursday, September 8, 2022, 16:15–16:30, S053

ARPES studies of Hf(0001) monocrystal: experiment and theory — •Saleem Ayaz Khan1, Laurent Nicolai1, Jean Zaraket2,3, Maria Christine Richter2,3, Olivier Heckmann2,3, Laxman Nagi Reddy2,3, Waly Ndiaye2,3, Mauro Fanciulli2,3, Karol Hricovini2,3, and Jan Minar11NTC, Univiversity of West Bohemia, Plzeň, Czech Republic — 2LPMS, CY Cergy Paris University, France — 3DRF, IRAMIS, LIDYL, CEA Saclay, France

We present first ARPES studies of the electronic structure of the Hf(0001) surface. High-Z materials have attracted much interest, because the strong spin-orbit coupling in combination with the broken inversion symmetry and an important effective electric field at the surface results in a spin-momentum locking. Spin-polarized electrons at the surface are of interest in physics and novel applications in electronics and data processing. Extra sharp peaks observed in experiment are identified thanks to ab-initio calculations performed within the SPR-KKR package. These extra states come from oxygen contamination of the highly reactive surface of Hf(0001). Further comparison is done on the ARPES level, thanks to the one-step model which include all matrix elements effect, resulting in an excellent agreement.

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