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Dissipative dynamics of planar d-wave Josephson junctions.

D V Khveshchenko1

  • 1Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.

Physical Review Letters
|February 21, 2006
PubMed
Summary

This study explores quantum dynamics in Josephson junctions. We analyzed phase transitions influenced by quasiparticle and Cooper pair tunneling, revealing key behaviors in the junction

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Superconductivity

Background:

  • Josephson junctions are crucial for quantum electronics.
  • Understanding phase transitions in superconductors is key to advancing quantum technologies.
  • D-wave superconductors exhibit unique quantum phenomena.

Purpose of the Study:

  • Investigate quantum dynamics and phase transitions in a Josephson junction.
  • Analyze the impact of quasiparticle and Cooper pair tunneling.
  • Determine the phase diagram and associated behaviors of the junction.

Main Methods:

  • Combined perturbative weak coupling analysis (charge representation).
  • Employed variational approach (phase representation) for strong coupling.
  • Developed an effective action incorporating nonlocal dissipative terms.

Main Results:

  • Identified nonlocal dissipative terms arising from tunneling processes.
  • Mapped out the phase diagram of the Josephson junction.
  • Characterized distinct behaviors corresponding to different regions of the phase diagram.

Conclusions:

  • The interplay of quasiparticle and Cooper pair tunneling significantly influences junction dynamics.
  • The study provides a comprehensive understanding of phase transitions in d-wave superconductor Josephson junctions.
  • Results offer insights for designing and controlling superconducting quantum devices.

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