Abstract
Magnetic nanostructures based on transition metals represent a main building block of standard memory devices. Their unique electronic properties are related to a complex multiplet structure of the partially filled d-shell with strong Coulomb interactions. Starting from a general formulation of the effective multi-orbital impurity problem for a transition metal atom in a fermionic bath of conduction electrons, the exact Quantum Monte Carlo solution is discussed. The concept of Hund’s impurities to describe the electronic structure and magnetism of transition metal adatoms becomes very useful for the interpretation of numerous experimental data.
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Acknowledgements
We would like to thank Alexey Rubtsov, Mikhail Katsnelson, Tim Wehling, Frank Lechermann, Vladimir Mazurenko, Livio Chioncel, Hartmut Hafermann, Sergey Iskakov, Evgeny Gorelov, Alexander Rudenko, Yaroslav Kvashnin, Alexander Shick, Jindřich Kolorenč, Philipp Werner and Olle Eriksson for the intense and fruitful cooperation over the years. Financial support of this work by the Deutsche Forschungsgemeinschaft through the Sonderforschungsbereich 668 (project A3) is gratefully acknowledged.
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Lichtenstein, A., Valentyuk, M., Mozara, R., Karolak, M. (2018). Electronic Structure and Magnetism of Correlated Nanosystems. In: Wiesendanger, R. (eds) Atomic- and Nanoscale Magnetism. NanoScience and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-99558-8_3
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