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Transport through quantum dots in mesoscopic circuits.

P S Cornaglia1, C A Balseiro

  • 1Instituto Balseiro and Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, 8400 San Carlos de Bariloche, Río Negro, Argentina.

Physical Review Letters
|June 6, 2003
PubMed
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We measured the Kondo cloud in quantum dots using finite wires. Conductance changes reveal the Kondo screening length, offering a new way to study this quantum phenomenon.

Area of Science:

  • Condensed matter physics
  • Quantum electronics

Background:

  • Quantum dots exhibit unique electronic properties due to quantum confinement.
  • The Kondo effect in quantum dots is a many-body phenomenon influencing electron transport.

Purpose of the Study:

  • Investigate electron transport through a quantum dot in the Kondo Coulomb blockade regime.
  • Explore the impact of finite wire lengths on quantum dot conductance.
  • Develop a method to measure the Kondo cloud using conductance sensitivity.

Main Methods:

  • Numerical renormalization group (NRG) calculations.
  • Modeling quantum dots embedded in mesoscopic devices with finite wires.

Main Results:

  • Finite size effects in quantum dots alter conductance.

Related Experiment Videos

  • Conductance becomes sensitive to the ratio of Kondo screening length to wire length.
  • This sensitivity allows for the measurement of the Kondo cloud.

    • Conclusions:

    • Finite wires in mesoscopic devices provide a novel approach to probe the Kondo effect.
    • The study demonstrates a method for experimentally determining the Kondo screening length.
    • Results offer insights into the spatial extent of the Kondo cloud.