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Related Concept Videos

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Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Updated: Dec 18, 2025

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Active Quasiparticle Suppression in a Non-Equilibrium Superconductor.

Marco Marín-Suárez1, Joonas T Peltonen1, Jukka P Pekola1

  • 1Pico group, QTF Centre of Excellence, Department of Applied Physics, Aalto University, FI-000 76 Aalto, Finland.

Nano Letters
|June 20, 2020
PubMed
Summary
This summary is machine-generated.

Quasiparticle poisoning in superconducting devices can be mitigated. This study demonstrates effective quasiparticle extraction using a single-electron transistor, significantly reducing excitation density.

Keywords:
hybrid single-electron turnstilequasiparticle controlquasiparticle extractionquasiparticle poisoningsuperconducting devices

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Area of Science:

  • Superconducting devices
  • Quantum electronics
  • Solid-state physics

Background:

  • Quasiparticle (qp) poisoning is a critical issue affecting superconducting device performance.
  • Non-equilibrium qp's are excited by device operation and stray radiation, even at low temperatures.
  • This reduces the coherence and functionality of sensitive superconducting circuits.

Purpose of the Study:

  • To demonstrate and quantify quasiparticle extraction in superconducting devices.
  • To investigate the effectiveness of extraction in a superconductor-insulator-normal metal-insulator-superconductor (SINIS) single-electron transistor.
  • To assess the impact of extraction on non-equilibrium quasiparticle density.

Main Methods:

  • Utilized voltage-biased superconducting junctions in a SINIS single-electron transistor.
  • Employed turnstile operation to inject excitations into superconducting leads.
  • Quantified quasiparticle density reduction with and without extraction enabled.

Main Results:

  • Demonstrated effective quasiparticle extraction in the turnstile operation regime.
  • Achieved a reduction in quasiparticle density by an order of magnitude.
  • Extraction remained effective even at high injection rates (2.4 × 10^8 qp's/second).

Conclusions:

  • Quasiparticle extraction is a viable method to combat poisoning in superconducting devices.
  • SINIS single-electron transistors can be used to actively manage non-equilibrium quasiparticles.
  • This technique offers a pathway to improve the reliability and performance of superconducting electronics.