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Uncovering the magnetic response of open-shell graphene nanostructures on metallic surfaces at different doping levels

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Abstract

Open-shell graphene nanostructures (GNs) are promising candidates for future spintronics and quantum technologies. Recent progress based on on-surface synthetic approach has successfully created such GNs on metallic surfaces. Meanwhile, the doping effect of metallic surfaces is inevitably present and can significantly tune their electronic and magnetic properties. Here, we investigate the zigzag end states of open-shell 7-armchair graphene nanoribbons (7-AGNRs) on Au(111), Au(100) and Ag(111) surfaces. Combined with the manipulation of a scanning tunneling microscope, we demonstrate that the end states can be tuned from empty states to singly occupied states and to doubly occupied states by substrate doping. Furthermore, the singly occupied states can be finely tuned, with the occupancy number of the states and related magnetic behaviors uncovered by experiments at different temperatures and magnetic fields. Our results provide a comprehensive study of the magnetic response of open-shell GNs on metallic surfaces at different doping levels.

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Author information

Authors and Affiliations

  1. School of Physics, Sun Yat-sen University, Guangzhou, 510275, China

    Zengfu Ou, Jun Wang, Jihai Zhang, Yukang Ding, Shenwei Chen, Wenya Zhai, Jingcheng Li, Dingyong Zhong & Donghui Guo

  2. Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-sen University, Guangzhou, 510275, China

    Zengfu Ou, Yukang Ding, Wenya Zhai, Jingcheng Li & Donghui Guo

  3. State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, 510275, China

    Jun Wang, Jihai Zhang, Shenwei Chen & Dingyong Zhong

  4. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Shenwei Chen

Authors
  1. Zengfu Ou
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  2. Jun Wang
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Corresponding authors

Correspondence to Jingcheng Li, Dingyong Zhong or Donghui Guo.

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

This work was supported by the Guangdong Major Project of Basic and Applied Basic Research (Grant No. 2021B0301030002), and the National Natural Science Foundation of China (Grant Nos. 11974431, and 11774434). Jincheng Li acknowledges the support from the Hundreds of Talents Program of Sun Yat-sen University and Guangdong Science and Technology Project (Grant No. 2021QN02X859).

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Ou, Z., Wang, J., Zhang, J. et al. Uncovering the magnetic response of open-shell graphene nanostructures on metallic surfaces at different doping levels. Sci. China Phys. Mech. Astron. 67, 226812 (2024). https://doi.org/10.1007/s11433-023-2261-2

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