Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Graphene II: Excitations and Nanoribbons (joint session O/TT)
O 14.2: Vortrag
Montag, 1. April 2019, 15:15–15:30, H24
Single Spin Localization and Manipulation in Graphene Open-Shell Nanostructures — •Jingcheng Li1, Sofia Sanz2, Martina Corso2,3, Deung Jang Choi2,3,5, Diego Peña4, Thomas Frederiksen2,5, and Jose Ignacio Pascual1,5 — 1CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain — 2DIPC, 20018 Donostia-San Sebastián, Spai — 3Centro de Física de Materiales (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain — 43CIQUS, Santiago de Compostela (Spain) — 5Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
Predictions state that graphene can spontaneously develop magnetism from the Coulomb repulsion of its π-electrons, but its experimental verification has been a challenge. Here, we report on the observation and manipulation of individual magnetic moments localized in graphene nanostructures on a Au(111) surface. Using scanning tunneling spectroscopy, we detected the presence of single electron spins localized around certain zigzag sites of the carbon backbone via the Kondo effect. Two near-by spins were found coupled into a singlet ground state, and the strength of their exchange interaction was measured via singlet-triplet inelastic tunnel electron excitations. Theoretical simulations demonstrate that electron correlations result in spin-polarized radical states with the experimentally observed spatial distributions. Hydrogen atoms bound to these radical sites quench their magnetic moment, permitting us to switch the spin of the nanostructure using the tip of the microscope.