Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 21: 2D Materials II: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)
HL 21.11: Talk
Monday, March 16, 2020, 17:45–18:00, WIL C107
Engineering intrinsic π-magnetism in nanographenes — •Shantanu Mishra1, Doreen Beyer2, Kristjan Eimre1, Shawulienu Kezilebieke3, Reinhard Berger2, Oliver Gröning1, Peter Liljeroth3, Carlo Pignedoli1, Xinliang Feng2, Pascal Ruffieux1, and Roman Fasel1 — 1Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland — 2Technical University of Dresden, Dresden, Germany — 3Aalto University, Espoo, Finland
Among the multitude of properties realized in organic compounds due to the chemical versatility of carbon, magnetism remains one of the most challenging. The electronic structure of polycyclic aromatic hydrocarbons (nanographenes) depends critically on the topology of the underlying π-electron network, which provides a tunable platform to realize all-carbon magnetism at the nanoscale.
Combining rational design principles with on-surface synthesis, we engineer and probe emergent magnetism in elusive magnetic nanographenes, namely, Clar's goblet [1] and extended triangulenes [2], and their covalently-bonded assemblies. Our experimental approach follows low-temperature scanning tunneling microscopy and inelastic electron tunneling spectroscopy, with further insights provided by mean-field and many-body perturbation theory calculations.
[1] S. Mishra et al., Nature Nanotech. (in press)
[2] S. Mishra et al., J. Am. Chem. Soc. 141, 10621 (2019)