Multi-orbital Kondo screening in strongly correlated polyradical nanographenes Article Swipe

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Kondo effect Antiferromagnetism Kondo insulator Condensed matter physics Spin (aerodynamics) Unpaired electron Physics Electron Strongly correlated material Materials science Chemistry Quantum mechanics Thermodynamics

Aitor Calvo-Fernández , Diego Soler‐Polo , Andrés Pinar Solé , Shaotang Song , Oleksandr Stetsovych , M. Kumar , Guangwu Li , Jishan Wu , Jiong Lu , Asier Eiguren , M. Blanco-Rey , Pavel Jelı́nek ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2309.08524 · OA: W4386876335

We discuss coexistence of Kondo and spin excitation signals in tunneling spectroscopy in strongly correlated polyradical $π$-magnetic nanographenes on a metal surface. The Kondo signal is rationalized by a multi-orbital Kondo screening of the unpaired electrons. The fundamental processes are spin-flips of antiferromagnetic (AFM) order involving charged molecular multiplets. We introduce a~perturbative model, which provides simple rules to identify the presence of AFM channels responsible for Kondo screening. The Kondo regime is confirmed by numerical renormalization group calculations. This framework can be applied to similar strongly correlated open-shell systems.