Coupled Spin States in Armchair Graphene Nanoribbons with Asymmetric Zigzag Edge Extensions

Sun, Qiang; Yao, Xuelin; Gröning, Oliver; Eimre, Kristjan; Pignedoli, Carlo A.; Müllen, Klaus; Narita, Akimitsu; Fasel, Roman; Ruffieux, Pascal (2020). Coupled Spin States in Armchair Graphene Nanoribbons with Asymmetric Zigzag Edge Extensions. Nano letters, 20(9), pp. 6429-6436. American Chemical Society 10.1021/acs.nanolett.0c02077

[img] Text
Accepted Manuscript.pdf - Accepted Version
Restricted to registered users only until 28 July 2021.
Available under License Publisher holds Copyright.

Download (2MB) | Request a copy

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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Fasel, Roman

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

1530-6984

Publisher:

American Chemical Society

Language:

English

Submitter:

Roman Fasel

Date Deposited:

03 Sep 2020 16:28

Last Modified:

11 Sep 2020 01:35

Publisher DOI:

10.1021/acs.nanolett.0c02077

PubMed ID:

32787158

BORIS DOI:

10.7892/boris.146338

URI:

https://boris.unibe.ch/id/eprint/146338

Actions (login required)

Edit item Edit item
Provide Feedback