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Related Concept Videos

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Biasing of P-N Junction

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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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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Scanning SQUID Study of Vortex Manipulation by Local Contact
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Revealing Josephson Vortex Dynamics in Proximity Junctions below Critical Current.

Vasily S Stolyarov1,2,3, Vsevolod Ruzhitskiy2,3, Razmik A Hovhannisyan1

  • 1Advanced Mesoscience and Nanotechnology Centre, Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia.

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|July 12, 2022
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Summary

We studied Josephson vortex motion in SNS Josephson junctions, finding distinct dynamic regimes. One regime, a fast hysteretic entry/escape, shows potential for low-dissipative logic and memory devices.

Keywords:
Josephson junctionsJosephson vorticescryo-electronicsmagnetic force microscopesuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Quantum Electronics
  • Materials Science

Background:

  • SNS Josephson junctions utilize a non-superconducting metal (N) between two superconductors (S) to blend electronic properties.
  • Andreev quasiparticles govern SNS junction behavior, unlike conventional SIS junctions.
  • Proximity effects induce superconducting correlations in the N layer.

Purpose of the Study:

  • Investigate Josephson vortex (JV) motion in Nb-Cu-Nb proximity junctions.
  • Analyze JV dynamics under electric currents and magnetic fields.
  • Identify potential applications for observed dynamic regimes.

Main Methods:

  • Combined local (magnetic force microscopy) and global (transport) experimental measurements.
  • Developed and utilized a numerical model for comparison with experimental data.
  • Analyzed distinct dynamic regimes of Josephson vortex motion.

Main Results:

  • Observed several distinct dynamic regimes for Josephson vortex motion.
  • Identified a fast hysteretic entry/escape regime below the critical Josephson current.
  • Correlated experimental findings with numerical model predictions.

Conclusions:

  • The fast hysteretic JV entry/escape regime is a key finding.
  • This regime is proposed for developing low-dissipative logic and memory elements.
  • SNS Josephson junctions offer novel quantum functionalities for advanced electronic devices.