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Institutskolloquium der Physik und Chemie: "Many-body Physics in Quantum Impurities and High-spin Molecules"

Die Hochschullehrer der Institute für Physik und Chemie der TU Ilmenau laden am Dienstag, dem 3. Dezember 2019, zu einem gemeinsamen Kolloquium der Physik und Chemie ein.

Es spricht um 17:15 Uhr im Faraday-Hörsaal Prof. Dr. Giorgio Sangiovanni, Institute of Theoretical Physics and Astrophysics, Julius-Maximilians-Universität Würzburg zum Thema "Many-body Physics in Quantum Impurities and High-spin Molecules".

Zum Vortrag:

Free isolated molecules get structurally as well as electronically remodeled by the presence of an atomic environment, such as a substrate or other molecules. The progresses in the understanding of this complex quantum mechanical influence are so rapid that an "on demand" microscopic control at the atomic scale is no longer considered an unreachable goal.

Transition-metal phthalocyanine (TMPc) molecules are characterized by magnetic moments arising from electrons hosted by the d-orbitals at the transition-metal site. The screening from the conduction electrons leads to a, sometimes controllable, Kondo effect.

In his talk Prof. Dr. Giorgio Sangiovanni will present different ways of manipulating the magnetic moment of TMPc, discussing at which stage we currently are in the control of the corresponding many-body correlations. He will show recent scanning tunneling microscopy experiments and density functional theory calculations and supplement the latter with full many-body continuous-time quantum Monte-Carlo calculations. The focus will be put on how the environment not only rearranges electronic levels or lifts orbital degeneracies, but how it can be also used to tune the strength of many-body interactions in single molecules.