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<p>Superconductors covered with periodic superstructures have attracted enormous research attention recently. However, most studies focus on the superstructures with periodicity longer than the superconductor coherence length. Here, we investigate the vacuum-cleaved 2H-NbSe<sub>2</sub> by scanning tunneling microscopy and spectroscopy. We reveal single-layer-high periodic nanostructures on the 2H-NbSe<sub>2</sub> surface, which arranges in about 15&#xa0;nm period, <i>i.e.</i> similar to the coherence length of 2H-NbSe<sub>2</sub>. Our position-dependent tunneling spectroscopy uncovers that the superconductivity at zero magnetic field is only marginally affected by the nanostructure, but the vortex shape is drastically altered. Our results establish the foundation for further research on nanostructures on superconductors.</p>

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Spectroscopy on superconductor surface modulated by periodic nanostructures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月18日

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  • Qiaoyan Yu,
  • Yufeng Liu,
  • Yi Yang,
  • Dang Liu,
  • Shasha Xue,
  • Xingsen Chen,
  • Ruijun Xi,
  • Jice Sun,
  • Xian Du,
  • Yi Zhang,
  • Xuhui Ning,
  • Tingwen Miao,
  • Pengyu Hu,
  • Weidong Luo,
  • Hao Yang,
  • Dandan Guan,
  • Xiaoxue Liu,
  • Liang Liu,
  • Yaoyi Li,
  • Shiyong Wang,
  • Canhua Liu,
  • Hao Zheng,
  • Jinfeng Jia

摘要

Superconductors covered with periodic superstructures have attracted enormous research attention recently. However, most studies focus on the superstructures with periodicity longer than the superconductor coherence length. Here, we investigate the vacuum-cleaved 2H-NbSe2 by scanning tunneling microscopy and spectroscopy. We reveal single-layer-high periodic nanostructures on the 2H-NbSe2 surface, which arranges in about 15 nm period, i.e. similar to the coherence length of 2H-NbSe2. Our position-dependent tunneling spectroscopy uncovers that the superconductivity at zero magnetic field is only marginally affected by the nanostructure, but the vortex shape is drastically altered. Our results establish the foundation for further research on nanostructures on superconductors.