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Updated: May 23, 2026

Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
Published on: February 2, 2012
Observation of Kondo cloud-coupling in a mirror-symmetric carbon nanotube array-molybdenum structure
Zheng Wei1,2, Zhisheng Peng3, Yu-Hao Wan3,4
1Nanofabrication Laboratory, National Center for Nanoscience and Technology, Beijing, China.
Researchers experimentally detected Kondo screening clouds in carbon nanotube devices. The Kondo effect
Area of Science:
- Condensed matter physics
- Materials science
- Quantum phenomena
Background:
- Magnetic impurities in metals form Kondo clouds, but experimental detection is difficult.
- Understanding Kondo screening is crucial for quantum phenomena and spintronics.
Purpose of the Study:
- To experimentally detect Kondo clouds and their coupling.
- To investigate the influence of device geometry on the Kondo effect.
Main Methods:
- Fabrication of devices with mirror-symmetric carbon nanotube arrays separated by a molybdenum strip.
- Measurement of the Kondo effect as a function of molybdenum strip width.
- Theoretical modeling using a two-spin model.
Main Results:
- Evidence of Kondo clouds and their coupling observed in the devices.
- The Kondo temperature exhibited two distinct plateaus (107.8 K and 15.8 K) corresponding to specific molybdenum strip widths.
- The results were explained by Kondo cloud formation and coupling within the molybdenum strip.
Conclusions:
- Experimental detection of Kondo clouds and their coupling is achievable.
- Device geometry, specifically molybdenum strip width, significantly influences the Kondo effect.
- These findings have potential implications for spintronics and quantum computing applications.
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