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Massive Dirac fermion behavior in a low bandgap graphene nanoribbon near a topological phase boundary

Qiang Sun1, Oliver Gröning1*, Jan Overbeck1,2, Oliver Braun1,2, Mickael L. Perrin1, Gabriela Borin Barin1, Maria El Abbassi1, Kristjan Eimre1, Edward Ditler1, Colin Daniels3, Vincent Meunier3, Carlo A. Pignedoli1*, Michel Calame1,2, Roman Fasel1,4, Pascal Ruffieux1*

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

2 Department of Physics, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland

3 Rensselaer Polytechnic Institute, Department of Physics, Applied Physics and Astronomy, Troy, NY, 12180 USA

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

* Corresponding authors emails: oliver.groening@empa.ch, carlo.pignedoli@empa.ch, pascal.ruffieux@empa.ch
DOI10.24435/materialscloud:gb-wz [version v1]

Publication date: Jul 15, 2020

How to cite this record

Qiang Sun, Oliver Gröning, Jan Overbeck, Oliver Braun, Mickael L. Perrin, Gabriela Borin Barin, Maria El Abbassi, Kristjan Eimre, Edward Ditler, Colin Daniels, Vincent Meunier, Carlo A. Pignedoli, Michel Calame, Roman Fasel, Pascal Ruffieux, Massive Dirac fermion behavior in a low bandgap graphene nanoribbon near a topological phase boundary, Materials Cloud Archive 2020.78 (2020), doi: 10.24435/materialscloud:gb-wz.


Graphene nanoribbons (GNRs) have attracted much interest due to their largely modifiable electronic properties. Manifestation of these properties requires atomically precise GNRs which can be achieved through a bottom–up synthesis approach. This has recently been applied to the synthesis of width‐modulated GNRs hosting topological electronic quantum phases, with valence electronic properties that are well captured by the Su–Schrieffer–Heeger (SSH) model describing a 1D chain of interacting dimers. In this record we provide data to support our recent publication where we demonstrate that ultralow bandgap GNRs with charge carriers behaving as massive Dirac fermions can be realized when their valence electrons represent an SSH chain close to the topological phase boundary, i.e., when the intra‐ and interdimer coupling become approximately equal. Such a system has been achieved via on‐surface synthesis based on readily available pyrene‐based precursors and the resulting GNRs are characterized by scanning probe methods. The pyrene‐based GNRs (pGNRs) can be processed under ambient conditions and incorporated as the active material in a field effect transistor. A quasi‐metallic transport behavior is observed at room temperature, whereas at low temperature, the pGNRs behave as quantum dots showing single‐electron tunneling and Coulomb blockade. This study may enable the realization of devices based on carbon nanomaterials with exotic quantum properties.

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15.3 KiB ReadME file in yaml format describing the files contained in the record
14.4 MiB tar file containing the files listed in ReadME.yaml
475.9 MiB AiiDA archive of nodes of the calculations


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External references

Journal reference
Q. Sun, O. Gröning, J. Overbeck, O. Braun, M. L. Perrin, G. Borin Barin, M. El Abbassi, K. Eimre, E. Ditler, C. Daniels, V. Meunier. C. A. Pignedoli, M. Calame, R. Fasel, P. Ruffieux, Adv. Mater. 32, 1906054 (2020) doi:10.1002/adma.201906054


MARVEL/DD3 SNSF ab initio graphene nanoribbons dirac fermions

Version history:

2020.78 (version v1) [This version] Jul 15, 2020 DOI10.24435/materialscloud:gb-wz