SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Mini-Symposium: Manipulation and control of spins on functional surfaces I

O 31.1: Hauptvortrag

Dienstag, 2. März 2021, 10:30–11:00, R2

What can we learn from atoms? — •Alexander Khajetoorians — SPM department, Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands

Based on scanning tunneling microscopy, magnetic atoms and films on surfaces have become a model playground to understand and design magnetic order, bottom-up. However, magnetic order in these model systems have been confined to the limits dominated by bistability. In this talk, based on the recently discovered concept of orbital memory and the anisotropic behavior of black phosphorus, I will illustrate new model atomic platforms to realize multi-modal landscapes and their resultant dynamics. I will first review the concept of energy-based neural networks and how they are linked to the physics of spin glasses in atomic systems. I will then highlight new examples based on the recent discovery of the so-called spin Q glass and the atomic Boltzmann machine. I will illustrate the creation of atomic-scale neurons and synapses, in addition to new learning concepts based on the separation of time scales and self-adaptive behavior. I will also discuss recent cutting-edge developments that enable magnetic characterization in new extreme limits, for example ESR-STM at the lowest temperatures available today, and the application of this platform. This work was performed with funding from NWO, with project number 680-47-534, and from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (SPINAPSE: grant agreement No 8183).