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Coherent versus sequential electron tunneling in quantum dots.

L E F Foa Torres1, C H Lewenkopf, H M Pastawski

  • 1Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.

Physical Review Letters
|October 4, 2003
PubMed
Summary

Quantum coherence explains puzzling conductance peaks in quantum dots. This research clarifies statistical features observed in low-temperature experiments using advanced theoretical models.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics

Background:

  • Quantum dots exhibit complex electronic behaviors under specific conditions.
  • Previous experiments observed unusual statistical features in conductance peak heights at low temperatures.

Purpose of the Study:

  • To investigate the role of quantum coherence in electronic transport through quantum dots.
  • To explain the statistical anomalies in conductance peak heights.

Main Methods:

  • Utilized the constant interaction model to describe electron interactions within the quantum dot.
  • Employed random matrix theory to model single-particle statistical fluctuations.
  • Accounted for the finite decay width of quantum dot energy levels.

Main Results:

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  • Quantum coherent tunneling processes were identified as the cause of observed conductance peak height variations.
  • The theoretical models successfully reproduced the puzzling statistical features.

Conclusions:

  • Quantum coherence significantly influences electronic transport in quantum dots.
  • The findings provide a theoretical explanation for experimental observations in the Coulomb-blockade regime.