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Coupled spin states in armchair graphene nanoribbons with asymmetric zigzag edge extensions

Qiang Sun1, Xuelin Yao2, Oliver Gröning1, Kristjan Eimre1, Carlo A. Pignedoli1*, Klaus Müllen2, Akimitsu Narita2,3, Roman Fasel1,4, Pascal Ruffieux1*

1 Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland

2 Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

3 Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0495, Japan

4 Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland

* Corresponding authors emails: carlo.pignedoli@empa.ch, pascal.ruffieux@empa.ch
DOI10.24435/materialscloud:4b-jt [version v1]

Publication date: Oct 12, 2020

How to cite this record

Qiang Sun, Xuelin Yao, Oliver Gröning, Kristjan Eimre, Carlo A. Pignedoli, Klaus Müllen, Akimitsu Narita, Roman Fasel, Pascal Ruffieux, Coupled spin states in armchair graphene nanoribbons with asymmetric zigzag edge extensions, Materials Cloud Archive 2020.115 (2020), doi: 10.24435/materialscloud:4b-jt.

Description

In this record we provide data supporting our recent work on coupled spin states in armchair nanoribbons. 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. Our results reveal 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.

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Keywords

graphene nanoribbon carbon magnetism on-surface synthesis MARVEL/DD3 SNSF CSCS

Version history:

2020.115 (version v1) [This version] Oct 12, 2020 DOI10.24435/materialscloud:4b-jt