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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Materials Science

Background:

  • Josephson junctions are fundamental to superconducting electronics.
  • Understanding their current-phase relations is crucial for device performance.
  • Platinum silicide offers unique properties for superconducting applications.

Purpose of the Study:

  • To investigate the current-phase relations of superconductor-constriction-superconductor Josephson junctions.
  • To quantify the nonlinearity in these junctions fabricated from platinum silicide.
  • To assess the impact of device lead inductance on junction nonlinearity.

Main Methods:

  • Fabrication of dc-superconducting quantum interference devices (SQUIDs) with platinum silicide Josephson junctions.
  • Measurement of magnetic-field-dependent electrical transport.
  • Numerical simulations using the Ginzburg-Landau theory for comparison.

Main Results:

  • Extracted current-phase relations for individual Josephson junctions.
  • Quantified the degree of nonlinearity within the junctions.
  • Observed that device lead kinetic inductance moderates the nonlinearity of the constrictions.

Conclusions:

  • Platinum silicide Josephson junctions exhibit significant nonlinearity.
  • Kinetic inductance of device leads plays a key role in modulating this nonlinearity.
  • These findings are critical for the practical design of superconducting circuits.