Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Organic Molecules at Surfaces 4: Chemistry on Surfaces
O 40.10: Vortrag
Mittwoch, 7. September 2022, 12:45–13:00, S051
Synthesis and Characterization of Triangulene: a novel concept of magnetic nanostructure made of carbon — •Francisco R. Lara1, Silvia Castro2, Jeremy Hieulle1, Manuel Vilas-Varela2, Alessio Vegliante1, Niklas Friedrich1, Lorenz Meyer1, Unai Uriarte-Amiano1, Sofia Sanz3, Dulce Rey2, Natalia E. Koval1, Martina Corso4,3, Emilio Artacho1,5, Thomas Frederiksen3, Diego Peña2, and Jose Ignacio Pascual1 — 1CIC nanoGUNE BRTA, Donostia, Spain — 2Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares, Santiago de Compostela, Spain — 3Donostia International Physics Center, Donostia, Spain — 4Centro de Física de Materiales, Donostia, Spain — 5Cavendish Laboratory, Cambridge, United Kingdom
In this talk, we present the synthesis and characterization of a [3]-triangulene ring of 6 units, the [3]-triangulene nanostar (TNS), and an aza-[5]-triangulene (A5T), on a Au(111) surface.
By means of scanning tunneling microscopy (STM) and spectroscopy (STS) the precise spin states of such carbon-based nanostructures have been studied. Such experimental findings, are supported by calculations from density functional theory (DFT), mean-field Hubbard model (MFH), and Heisenberg model.
Both nanostuctures are achieved thanks to on-surface synthesis. TNS hosts antiferromagnetically coupled spin-1 showing a complex many-body inelastic excitation spectrum. A5T ground state has a spin larger than one. Here the presence of the N heteroatom substitution plays an important role in the spin state on surface.