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Related Experiment Videos

Superconducting junctions perturbed by environmental fluctuation.

Jing-hui Li1

  • 1CCAST (World Laboratory), Beijing, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 26, 2005
PubMed
Summary

Environmental perturbations in superconducting junctions can generate a net voltage, exhibiting resonance with noise strength. Controlling noise correlations allows voltage reversal, offering insights into superconducting device behavior under noise.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena
  • Superconductivity

Background:

  • Superconducting junctions are sensitive to environmental factors.
  • Noise in quantum systems can lead to complex behaviors.
  • Understanding noise effects is crucial for device stability and control.

Purpose of the Study:

  • To investigate the impact of environmental perturbations, specifically additive and multiplicative noise, on superconducting junctions.
  • To analyze the generation and control of net voltage in these devices.
  • To study the mean first passage time (MFPT) and transition rates under varying noise conditions.

Main Methods:

  • Theoretical investigation of a superconducting junctions device under environmental perturbation.
  • Analysis of net voltage generation as a function of additive noise strength.

Related Experiment Videos

  • Examination of voltage reversal by controlling correlations between additive and multiplicative noises.
  • Study of direct current (dc) voltage versus dc current characteristics.
  • Calculation of mean first passage time (MFPT) for electron pairs.

    • Main Results:

    • A net voltage is produced, showing resonance with additive noise strength, and can be positive, negative, or zero.
    • Net voltage can be reversed by controlling the correlation between additive and multiplicative noises.
    • Increasing additive noise strength shifts the dc voltage-current curve towards Ohmic behavior.
    • The dc voltage-current characteristics are controllable via noise strengths.
    • Positive correlations between noises suppress the transition rate, which exhibits a minimum with varying noise strengths.

    Conclusions:

    • Environmental noise significantly influences the electrical properties of superconducting junctions.
    • The observed phenomena, including voltage resonance and reversal, offer potential for noise-based control in superconducting devices.
    • Noise strength and correlation are critical parameters for manipulating device behavior and electron transport dynamics.