Coupled Spin States in Armchair Graphene Nanoribbons with Asymmetric Zigzag Edge Extensions
- Qiang SunQiang SunEmpa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, SwitzerlandMore by Qiang Sun
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- Xuelin YaoXuelin YaoMax Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, GermanyMore by Xuelin Yao
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- Oliver GröningOliver GröningEmpa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, SwitzerlandMore by Oliver Gröning
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- Kristjan EimreKristjan EimreEmpa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, SwitzerlandMore by Kristjan Eimre
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- Carlo A. PignedoliCarlo A. PignedoliEmpa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, SwitzerlandMore by Carlo A. Pignedoli
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- Klaus MüllenKlaus MüllenMax Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, GermanyMore by Klaus Müllen
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- Akimitsu Narita*Akimitsu Narita*Email: [email protected]Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, GermanyOrganic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0495, JapanMore by Akimitsu Narita
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- Roman FaselRoman FaselEmpa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, SwitzerlandDepartment of Chemistry and Biochemistry, University of Bern, 3012 Bern, SwitzerlandMore by Roman Fasel
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- Pascal Ruffieux*Pascal Ruffieux*Email: [email protected]Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, SwitzerlandMore by Pascal Ruffieux
Abstract

Exact positioning of sublattice imbalanced nanostructures in graphene nanomaterials offers a route to control interactions between induced local magnetic moments and to obtain graphene nanomaterials with magnetically nontrivial ground states. Here, we show that such sublattice imbalanced nanostructures can be incorporated along a large band gap armchair graphene nanoribbon on the basis of asymmetric zigzag edge extensions, achieved by incorporating specifically designed precursor monomers. Scanning tunneling spectroscopy of an isolated and electronically decoupled zigzag edge extension reveals Hubbard-split states in accordance with theoretical predictions. Mean-field Hubbard-based modeling of pairs of such zigzag edge extensions reveals ferromagnetic, antiferromagnetic, or quenching of the magnetic interactions depending on the relative alignment of the asymmetric edge extensions. Moreover, a ferromagnetic spin chain is demonstrated for a periodic pattern of zigzag edge extensions along the nanoribbon axis. This work opens a route toward the fabrication of graphene nanoribbon-based spin chains with complex magnetic ground states.
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