Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 51: Poster Wednesday: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy
O 51.10: Poster
Wednesday, September 7, 2022, 18:00–20:00, P4
The Emergence of Magnetism in [5]-Aza-Triangulene — •Lorenz Meyer1, Francisco Romero Lara1, Niklas Friedrich1, Alessio Vegliante1, Manuel Vilas Varela2, Unai Uriarte Amiano1, Natalia Koval1, Emilio Artacho Cortés1, Diego Peña Gil2, and Jose Ignacio Pascual1 — 11 CIC nanoGUNE, San Sebastian (Spain) — 2Centro Singular de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Santiago de Compostela (Spain)
Zigzag-edged Graphene triagulenes are known to host a magnetic ground state due to sublattice imbalance. The magnetic properties of these structures can be tuned by the size of the triangulene or via heteroatom substitution. This makes them intriguing for future spintronic applications paving the way towards organic logical devices. So far, the influence of heteroatoms in larger triangulenes seems to be unknown. In our work, we report the bottom-up synthesis of [5] aza-Triangulene by means of surface-assisted cyclodehydrogenation on a Au(111) surface. Electronic transport measurements carried out with a scanning tunneling microscope reveal the high-spin ground state of this molecule via low energy phenomena. Additionally, we shine light on not only the influence of heteroatoms but also of additional Hydrogen atoms and defects which are able to tune the magnetic ground state. Density functional theory and Mean-Field-Hubbard calculations confirm the spin texture and the electronic structure of the observed molecules.