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Edge disorder in bottom-up zigzag graphene nanoribbons: implications for magnetism and quantum electronic transport

Michele Pizzochero1,2,3*, Gabriela Borin Barin4, Kristiāns Čerņevičs1,2, Shiyong Wang4, Pascal Ruffieux4, Roman Fasel4,5, Oleg V. Yazyev1,2

1 Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

2 National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

3 School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States

4 Nanotech@Surfaces Laboratory, Swiss Federal Laboratories for Materials Science and Technology (EMPA), CH-8600 Dübendorf, Switzerland

5 Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, CH-3012 Bern, Switzerland

* Corresponding authors emails: mpizzochero@g.harvard.edu
DOI10.24435/materialscloud:xf-r3 [version v1]

Publication date: Nov 03, 2021

How to cite this record

Michele Pizzochero, Gabriela Borin Barin, Kristiāns Čerņevičs, Shiyong Wang, Pascal Ruffieux, Roman Fasel, Oleg V. Yazyev, Edge disorder in bottom-up zigzag graphene nanoribbons: implications for magnetism and quantum electronic transport, Materials Cloud Archive 2021.187 (2021), doi: 10.24435/materialscloud:xf-r3.

Description

We unveil the nature of the structural disorder in bottom-up zigzag graphene nanoribbons along with its effect on the magnetism and electronic transport on the basis of scanning probe microscopies and first-principles calculations. We find that edge-missing m-xylene units emerging during the cyclodehydrogenation step of the on-surface synthesis are the most common point defects. These “bite” defects act as spin-1 paramagnetic centers, severely disrupt the conductance spectrum around the band extrema, and give rise to spin-polarized charge transport. We further show that the electronic conductance across graphene nanoribbons is more sensitive to “bite” defects forming at the zigzag edges than at the armchair ones. Our work establishes a comprehensive understanding of the low-energy electronic properties of disordered bottom-up graphene nanoribbons.

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Keywords

graphene nanoribbons GNR electronic transport magnetism defects SNSF MARVEL CSCS Graphene flagship core 3 ONR

Version history:

2021.187 (version v1) [This version] Nov 03, 2021 DOI10.24435/materialscloud:xf-r3