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<p>Nonreciprocal transport is one of the cornerstones of modern electronics industry with semiconductor diode serving as the most celebrated representative. Recently, superconducting diode has been put forward to achieve nonreciprocal transport in the non-dissipative regime. However, most of superconducting diodes require the application of magnetic field, limiting their practical application. Here we report a field-free diode effect in the van der Waals Josephson junctions composed of 2H-NbSe<sub>2</sub> thin flakes without extra barrier layers. The unexpected large asymmetric current-voltage profile at zero field is observed in both overdamped and underdamped Josephson junctions. Under magnetic fields, the asymmetry of critical current is suppressed with a sign reversal. The realization of field-free Josephson diode with high rectification ratio in such a simple configuration not only implies an implicit spontaneous time-reversal symmetry breaking effect that challenges the existing theories, but also provides a promising avenue for the development of superconducting electronics and quantum devices.</p>

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Field-free Josephson diode effect in NbSe2 van der Waals junction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月31日

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  • Jiaxiang Ma,
  • Huiyu Wang,
  • Weizhuang Zhuo,
  • Bin Lei,
  • Shuai Wang,
  • Wenxiang Wang,
  • Xin-Yu Chen,
  • Zhen-Yu Wang,
  • Binghui Ge,
  • Zhen Wang,
  • Jing Tao,
  • Kun Jiang,
  • Ziji Xiang,
  • Xian-Hui Chen

摘要

Nonreciprocal transport is one of the cornerstones of modern electronics industry with semiconductor diode serving as the most celebrated representative. Recently, superconducting diode has been put forward to achieve nonreciprocal transport in the non-dissipative regime. However, most of superconducting diodes require the application of magnetic field, limiting their practical application. Here we report a field-free diode effect in the van der Waals Josephson junctions composed of 2H-NbSe2 thin flakes without extra barrier layers. The unexpected large asymmetric current-voltage profile at zero field is observed in both overdamped and underdamped Josephson junctions. Under magnetic fields, the asymmetry of critical current is suppressed with a sign reversal. The realization of field-free Josephson diode with high rectification ratio in such a simple configuration not only implies an implicit spontaneous time-reversal symmetry breaking effect that challenges the existing theories, but also provides a promising avenue for the development of superconducting electronics and quantum devices.