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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, 14:06 and posted on 23.09.2020, 11:47 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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