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<p>Magnetic impurities in a non-magnetic metal are screened by conduction electrons, forming a spin cloud known as a Kondo cloud. Experimental detection of this Kondo screening cloud in dilute magnetic alloys remains challenging. Here we show evidence of Kondo clouds and their coupling in devices composed of mirror-symmetric carbon nanotube arrays separated by a molybdenum strip. The Kondo effect in these devices depends sensitively on the width of the molybdenum strip. For widths of 0.3-1.2 micrometers and 1.5-3.0 micrometers, the Kondo temperature forms two plateaus at about 107.8 kelvin and 15.8 kelvin, respectively. These results are explained by the formation of Kondo clouds and by intra-edge and inter-edge coupling within molybdenum. Calculations based on a two-spin model reproduce the two plateaus and their crossover. These findings may open opportunities for applications in spintronics and quantum computing.</p>

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Observation of Kondo cloud-coupling in a mirror-symmetric carbon nanotube array-molybdenum structure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月22日

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  • Zheng Wei,
  • Zhisheng Peng,
  • Yu-Hao Wan,
  • Zhongpu Wang,
  • Ziyi Han,
  • Xiaoxu Zhao,
  • Enzheng Shi,
  • Yong Jun Li,
  • Weiguo Chu,
  • Jian Zhang,
  • Liu Qian,
  • Jin Zhang,
  • Qing-Feng Sun,
  • Lianfeng Sun

摘要

Magnetic impurities in a non-magnetic metal are screened by conduction electrons, forming a spin cloud known as a Kondo cloud. Experimental detection of this Kondo screening cloud in dilute magnetic alloys remains challenging. Here we show evidence of Kondo clouds and their coupling in devices composed of mirror-symmetric carbon nanotube arrays separated by a molybdenum strip. The Kondo effect in these devices depends sensitively on the width of the molybdenum strip. For widths of 0.3-1.2 micrometers and 1.5-3.0 micrometers, the Kondo temperature forms two plateaus at about 107.8 kelvin and 15.8 kelvin, respectively. These results are explained by the formation of Kondo clouds and by intra-edge and inter-edge coupling within molybdenum. Calculations based on a two-spin model reproduce the two plateaus and their crossover. These findings may open opportunities for applications in spintronics and quantum computing.