Magnetism of graphene quantum dots

Yuanyuan Sun; Yongping Zheng; Hongzhe Pan; Jie Chen; Weili Zhang; Lin Fu; Kaiyu Zhang; Nujiang Tang; Youwei Du

doi:10.1038/s41535-017-0010-2

npj Quantum Materials (Jan 2017)

Magnetism of graphene quantum dots

Yuanyuan Sun,
Yongping Zheng,
Hongzhe Pan,
Jie Chen,
Weili Zhang,
Lin Fu,
Kaiyu Zhang,
Nujiang Tang,
Youwei Du

Affiliations

Yuanyuan Sun: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Yongping Zheng: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Hongzhe Pan: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Jie Chen: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Weili Zhang: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Lin Fu: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Kaiyu Zhang: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Nujiang Tang: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University
Youwei Du: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University

DOI: https://doi.org/10.1038/s41535-017-0010-2
Journal volume & issue: Vol. 2, no. 1
pp. 1 – 7

Abstract

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Condensed matter physics: intrinsic magnetism emerges in graphene quantum dots A local magetic moment emerges in nanoscale high purity graphene quantum dots, probably resulting from edge passivation. A team led by Nujiang Tang at Nanjing University synthesized high purity graphene quantum dots with an average diameter of about 2.04 nm and average height of about 0.52 nm. They found that a local moment of 1.2 µB were carried by spin polarized edge state appearing in a small number of quantum dots at 2K, with the likely origin from hydroxyl passivation on carbon. The majority dots are nonmagnetic due to the suppression of edge magnetism by defects or reconstruction at the edge. These results may provide insights into the intrinsic magnetism of graphene quantum dots and pave a way towards edge magnetism by various chemical passivation.

Published in npj Quantum Materials

ISSN: 2397-4648 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials; Science: Physics: Atomic physics. Constitution and properties of matter
Website: https://www.nature.com/npjquantmats/

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