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Dissipation-driven phase transition in two-dimensional Josephson arrays.

Luca Capriotti1, Alessandro Cuccoli, Andrea Fubini

  • 1Valuation Risk Group, Credit Suisse First Boston (Europe) Ltd., One Cabot Square, London E14 4QJ, United Kingdom.

Physical Review Letters
|May 21, 2005
PubMed
Summary
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Dissipation influences quantum phase transitions in Josephson junction arrays. Moderate dissipation preserves reentrant transitions, while strong dissipation stabilizes superconductivity at low temperatures.

Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Superconductivity

Background:

  • Quantum phase transitions are fundamental phenomena in condensed matter physics.
  • Josephson junction arrays are model systems for studying quantum phenomena.
  • Dissipative effects can significantly alter quantum phase transitions.

Purpose of the Study:

  • To investigate the interplay of dissipative and quantum effects near a quantum phase transition.
  • To analyze the behavior of a resistively shunted two-dimensional Josephson junction array.
  • To understand how dissipation affects reentrant superconducting-to-normal phase transitions.

Main Methods:

  • Utilizing an advanced Fourier path-integral Monte Carlo algorithm.
  • Studying a two-dimensional Josephson junction array with resistive shunting.

Related Experiment Videos

  • Analyzing the system's behavior across a range of dissipation strengths and quantum coupling.

    • Main Results:

    • The reentrant superconducting-to-normal phase transition persists for moderate dissipation but disappears for small resistance.
    • For large quantum coupling, superconductivity is stabilized at low temperatures beyond a critical dissipation strength.
    • A comprehensive phase diagram illustrating these effects has been generated.

    Conclusions:

    • Dissipation plays a crucial role in determining the phase diagram of Josephson junction arrays.
    • The findings explain recent experimental observations of reentrant phase transitions.
    • Understanding this interplay is key for designing and controlling superconducting quantum devices.