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Biasing of Metal-Semiconductor Junctions01:27

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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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Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions.

D Massarotti1, A Pal2, G Rotoli3

  • 11] Dipartimento di Fisica, Università degli Studi di Napoli 'Federico II', Monte S.Angelo, I-80126 Napoli, Italy [2] CNR-SPIN UOS Napoli, Monte S.Angelo-via Cinthia, I-80126 Napoli, Italy.

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We observed macroscopic quantum tunneling in superconductor-ferromagnet-superconductor junctions, demonstrating their potential for active quantum applications in hybrid circuits. This research highlights spin-filter Josephson systems for future quantum technologies.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Interfacial coupling of superconductors (S) and ferromagnets (F) is crucial for novel physics and applications.
  • Spin-filter Josephson junctions and triplet supercurrents suggest potential for dissipationless spintronics.

Purpose of the Study:

  • To demonstrate active quantum applications of superconductor-ferromagnet-superconductor (S-F-S) junctions.
  • To investigate macroscopic quantum tunneling in Josephson junctions with ferromagnetic insulator barriers.

Main Methods:

  • Fabrication and characterization of S-F-S Josephson junctions utilizing Gadolinium Nitride (GdN) ferromagnetic insulator barriers.
  • Observation of macroscopic quantum tunneling and analysis of the transition from thermal to quantum regimes.

Main Results:

  • Clear evidence of macroscopic quantum tunneling in S-F-S junctions with GdN barriers.
  • Observation of a transition from thermal to quantum regime at approximately 100 mK at zero magnetic field.
  • Junctions exhibit signatures of unconventional superconductivity.

Conclusions:

  • The observed quantum phenomena pave the way for active utilization of spin-filter Josephson systems in quantum hybrid circuits.
  • This work advances the development of dissipationless spintronics and novel quantum technologies.