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Kondo effect from a tunable bound state within a quantum wire.

F Sfigakis1, C J B Ford, M Pepper

  • 1Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, CB3 OHE, United Kingdom. fs228@cam.ac.uk

Physical Review Letters
|February 1, 2008
PubMed
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This study reveals the 0.7 structure in quantum wires is not due to the singlet Kondo effect. Instead, a weakly bound state likely causes these observed characteristics in real quantum wires.

Area of Science:

  • Condensed Matter Physics
  • Quantum Transport

Background:

  • The 0.7 structure in quantum wires is a notable phenomenon in quantum transport.
  • Its origin, particularly its relation to the Kondo effect, remains a subject of research.

Purpose of the Study:

  • To investigate the conductance of quantum wires with variable open quantum dot geometry.
  • To determine the relationship between the 0.7 structure and the Kondo effect.

Main Methods:

  • Fabrication and measurement of quantum wires with tunable quantum dot geometry.
  • Analysis of electrical conductance characteristics, focusing on the Kondo effect and 0.7 structure.

Main Results:

  • Observed an exceptionally strong Kondo effect and most 0.7 structure characteristics.

Related Experiment Videos

  • Results indicate the 0.7 structure is not a manifestation of the singlet Kondo effect.

    • Conclusions:

    • The 0.7 structure in quantum wires is likely not caused by the singlet Kondo effect.
    • Similarities suggest a weakly bound state is frequently present in real quantum wires, contributing to the 0.7 structure.