Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 118: Surface Magnetism II (joint session O/MA)
O 118.9: Talk
Friday, March 20, 2020, 12:30–12:45, GER 38
Ensembles of Orbital Memories on Black Phosphorus — •Elze Knol1, Brian Kiraly1, Hilbert Kappen2, and Alexander Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 2Donders Institute for Neuroscience, Radboud University, Nijmegen, The Netherlands
Cobalt atoms at the surface of black phosphorus (BP) have demonstrated bistable valencies [1], which can be utilized to store digital information. According to density functional theory calculations, each valency hosts a unique magnetic moment. The calculations further reveal that the bistable valencies arise due to a vertical atom displacement which modifies the screening from the underlying BP. In order to study the role of this screening, we take advantage of the tip-induced band bending occurring at the tip-sample junction of a scanning tunneling microscope to probe the energy landscape governing the valency stability. We find, both in single atom memories and ensembles of atomic memories, that the effects of local band bending are depending on the black phosphorus surface. We visualize this dependency directly with a scanning tunneling microscope by carefully studying the position dependence of the stochastic current noise. The inherent properties of this system [2] provide a unique opportunity for atomic ensembles in solids.
[1] Kiraly, et. al., Nature Commun. 9, 3904, (2018). [2] Kiraly, et. al., Phys. Rev. Lett. 123, 216403, (2019).