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Related Experiment Videos

Local moment formation in quantum point contacts.

Kenji Hirose1, Yigal Meir, Ned S Wingreen

  • 1Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan.

Physical Review Letters
|February 7, 2003
PubMed
Summary
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Spin-density-functional theory shows a local electron spin moment forms in quantum point contacts (QPCs), supporting recent Kondo effect findings. This moment

Area of Science:

  • Condensed matter physics
  • Quantum electronics

Background:

  • Quantum point contacts (QPCs) are crucial nanoscale electronic devices.
  • Recent studies suggest a Kondo effect in QPCs.

Purpose of the Study:

  • Investigate the electronic properties of quantum point contacts using spin-density-functional theory.
  • Determine the nature and behavior of local magnetic moments within QPCs.

Main Methods:

  • Application of spin-density-functional theory (SDFT).
  • Theoretical modeling of quantum point contacts.

Main Results:

  • SDFT calculations reveal the formation of a local moment with a net one-electron spin near the QPC.
  • The hybridization of this local moment with the device leads diminishes as the QPC length increases.

Related Experiment Videos

  • On-site Coulomb interaction energy remains largely unaffected by QPC length.

    • Conclusions:

    • The findings provide theoretical support for the experimental observation of a Kondo effect in QPCs.
    • The study elucidates the relationship between QPC geometry, local spin moments, and their hybridization.