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O: Fachverband Oberflächenphysik

O 13: Poster Session I: Surface magnetism I

O 13.1: Poster

Montag, 1. März 2021, 10:30–12:30, P

Scaling Information Technology to the Atomic Limits — •Brian Kiraly, Elze J. Knol, Werner M.J. van Weerdenburg, Daniel Wegner, and Alexander A. Khajetoorians — Radboud University, Nijmegen, The Netherlands

The end of the scaling era in microelectronics and the expanding demand for computational resources will require new fundamental approaches to energy-efficient computing. The successes of software-based artificial intelligence are promising in this direction, yet the big payoffs promised from hardware implementations are much rarer, as they require the development of dynamic physical systems with tunable, memory-bearing coupling. In this talk, I will discuss our efforts to connect these computational requirements to the physics of single atoms on the surface of the semiconductor black phosphorus. I will show how the screening characteristics of the surface play an important role in stabilizing multiple orbital configurations, or valencies, and how these valencies realize robust non-volatile memory. I will then discuss the valency dynamics in coupled cobalt ensembles on black phosphorus. After revealing how the anisotropic surface- mediated interactions enable tunable atomic coupling, I will demonstrate that a fully functional atomic scale neural network, or so-called Boltzmann machine, can be derived from just seven cobalt atoms on black phosphorus. With two naturally separated time scales, one for computation and one for learning, this atomic Boltzmann machine further presents the possibility for autonomous learning based on the response of the system to external stimuli.