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Related Experiment Videos

Dynamical coulomb blockade of multiple Andreev reflections.

A Levy Yeyati1, J C Cuevas, A Martín-Rodero

  • 1Departamento de Física Teórica de la Materia Condensada CV, Universidad Autónoma de Madrid, E28049 Madrid, Spain.

Physical Review Letters
|August 11, 2005
PubMed
Summary

We studied dynamical Coulomb blockade in superconducting quantum point contacts. The blockade effect depends on transmission, with potential current enhancement due to electromagnetic environment coupling.

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Area of Science:

  • Condensed matter physics
  • Quantum electronics

Background:

  • Dynamical Coulomb blockade is a quantum effect observed in nanoscale electronic devices.
  • Multiple Andreev reflections (MAR) involve the passage of Cooper pairs across a superconductor-normal metal interface.

Purpose of the Study:

  • To analyze the dynamical Coulomb blockade of multiple Andreev reflections (MAR) in a superconducting quantum point contact.
  • To investigate the influence of macroscopic impedance and transmission on the blockade phenomenon.

Main Methods:

  • Theoretical analysis of a superconducting quantum point contact coupled to a macroscopic impedance.
  • Examination of the blockade scaling with bias voltage and superconducting gap at varying transmission probabilities.

Main Results:

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  • At low transmission, blockade scales as n^2, corresponding to charge shots of ne.
  • Higher transmission reduces blockade due to Pauli principle and elastic renormalization.
  • An anti-blockade (current enhancement) can occur due to electromagnetic environment coupling.

Conclusions:

  • The interplay between Coulomb blockade, MAR, and electromagnetic environment is complex.
  • Transmission probability is a critical factor determining blockade or anti-blockade behavior.
  • This research offers insights into quantum transport phenomena in superconducting circuits.