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[7]TQR_Manuscript.pdf (7.02 MB)

On-surface Synthesis of [7]triangulene Quantum Ring via Antidot Engineering

preprint
submitted on 22.09.2020 and posted on 23.09.2020 by Jie Su, Wei Fan, Pingo Mutombo, Xinnan Peng, Shaotang Song, Mykola Telychko, Pavel Jelinek, Jishan Wu, Jiong Lu
The ability to engineer geometrically well-defined antidots in large triangulene homologues allows for creating an entire family of triangulene quantum ring (TQR) structures with tunable high-spin ground state and magnetic ordering, crucial for next-generation molecular spintronic devices. Herein, we report the synthesis of an open-shell [7]triangulene quantum ring ([7]TQR) molecule on Au(111) through the surface-assisted cyclodehydrogenation of a rationally-designed kekulene derivative. Bond-resolved scanning tunneling microscopy (BR-STM) unambiguously imaged the molecular backbone of a single [7]TQR with a triangular zigzag edge topology, which can be viewed as [7]triangulene decorated with a coronene-like antidot in the molecular centre. Additionally, dI/dV mapping reveals that both inner and outer zigzag edges contribute to the edge-localized and spin-polarized electronic states of [7]TQR. Both experimental results and spin-polarized density functional theory calculations indicate that [7]TQR retains its open-shell septuple ground-state (� = 3) on Au(111). This work demonstrates a new route for the design of high-spin graphene quantum rings as the key components for future quantum devices.

Funding

MOE2017-T2-1-056

MOE2019-T2-2-044

R-143-000-A75-11

R-143-000-B58-114

NRF-NRFI05-2019-0005

MOE2018-T2-2-094

GACR Expro 20-13692X

LM2015042

LM2015085

History

Email Address of Submitting Author

chmsuji@nus.edu.sg

Institution

National University of Singapore

Country

Singapore

ORCID For Submitting Author

0000-0003-1071-9556

Declaration of Conflict of Interest

The authors declare no conflict of interest.

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