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O: Fachverband Oberflächenphysik
O 59: Electronic Structure of Surfaces I
O 59.8: Vortrag
Mittwoch, 29. März 2023, 17:00–17:15, REC C 213
Termination dependent many-body interactions of the surface states of PdCoO2 revealed by ARPES-based microscopy — •Gesa-Roxanne Siemann1, Edgar Abarca Morales1,2, Philip A. E. Murgatroyd1, Tommaso Antonelli1, Seunghyun Khim2, Matthew Watson3, Cephise Cacho3, Andrew P. Mackenzie1,2, and Phil D. C. King1 — 1University of St Andrews, UK — 2MPI for Chemical Physics of Solids, Dresden, Germany — 3Diamond Light Source, UK
The layered ABO2 structure of the delafossite oxides yields markedly different electronic structures at their A- and BO2-terminated surfaces which are either electron- (A-termination) or hole-doped (BO2-termination) with respect to the bulk1. A prominent example is PdCoO2 where a giant Rashba effect can be observed on the CoO2 terminated surface2, while the Pd terminated surface hosts ferromagnetic states which are absent in the bulk3,4. However, the study of these states has often been hampered by the size of domains of each distinct surface termination. Here we show how these problems can be circumvented using micro-ARPES performed in a spatially-resolved mode. Our measurements further reveal strong signatures of self-energy modulations on both surfaces due to coupling to bosonic modes, making them the ideal playground to study varying coupling mechanisms and their tunability in the same sample. 1A. P. Mackenzie, Rep. Prog. Phys. 80, 032501 (2017), 2V. Sunko et al., Nature 549, 492-496 (2017), 3F. Mazzola et al., PNAS 115(51)12956-12960 (2018), 4F. Mazzola et al., npj Quantum Materials 7, 20 (2022)