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Coulomb blockade with dispersive interfaces.

A Kamenev1, A I Larkin

  • 1Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review Letters
|December 18, 2002
PubMed
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The effective charging energy, not the bare value, controls Coulomb blockade oscillations when dot-lead conductance is frequency dependent. This effective energy accounts for interface capacitance or inductance effects.

Area of Science:

  • Quantum electronics
  • Mesoscopic physics

Background:

  • Coulomb blockade oscillations are a key phenomenon in quantum dots.
  • The dot-lead conductance's frequency dependence complicates understanding these oscillations.

Purpose of the Study:

  • To identify the controlling quantity for Coulomb blockade oscillations under frequency-dependent dot-lead conductance.
  • To investigate the role of effective charging energy and interface effects.

Main Methods:

  • Theoretical analysis of Coulomb blockade oscillations.
  • Consideration of frequency-dependent dot-lead conductance.
  • Application of perturbation theory and instanton calculus for weak and strong coupling regimes.

Main Results:

  • The conductance at an imaginary frequency, determined by effective charging energy, controls Coulomb blockade oscillations.

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  • Interface-induced capacitance or inductance can significantly alter the effective charging energy from its bare value.

    • Conclusions:

    • Effective charging energy, incorporating interface effects, is crucial for understanding Coulomb blockade in frequency-dependent systems.
    • Theoretical frameworks for both weak and strong coupling regimes support these findings.