Engineering of Magnetic Coupling in Nanographene

Zheng Y, Li C, Zhao Y, Beyer D, Wang G, Xu C, Yue X, Chen Y, Guan DD, Li YY, Zheng H, Liu C, Luo W, Feng X, Wang S, Jia J (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Physical Review Letters American Physical Society

Book Volume: 124

Article Number: 147206

Journal Issue: 14

DOI: 10.1103/PhysRevLett.124.147206

Abstract

Nanographenes with sublattice imbalance host a net spin according to Lieb's theorem for bipartite lattices. Here, we report the on-surface synthesis of atomically precise nanographenes and their atomic-scale characterization on a gold substrate by using low-temperature noncontact atomic force microscopy and scanning tunneling spectroscopy. Our results clearly confirm individual nanographenes host a single spin of S=1/2 via the Kondo effect. In covalently linked nanographene dimers, two spins are antiferromagnetically coupled with each other as revealed by inelastic spin-flip excitation spectroscopy. The magnetic exchange interaction in dimers can be well engineered by tuning the local spin density distribution near the connection region, consistent with mean-field Hubbard model calculations. Our work clearly reveals the emergence of magnetism in nanographenes and provides an efficient way to further explore the carbon-based magnetism.

Involved external institutions

Shanghai Jiao Tong University / 上海交通大学 CN China (CN) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Zheng, Y., Li, C., Zhao, Y., Beyer, D., Wang, G., Xu, C.,... Jia, J. (2020). Engineering of Magnetic Coupling in Nanographene. Physical Review Letters, 124(14). https://doi.org/10.1103/PhysRevLett.124.147206

MLA:

Zheng, Yuqiang, et al. "Engineering of Magnetic Coupling in Nanographene." Physical Review Letters 124.14 (2020).

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