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Phase biasing of a Josephson junction using Rashba-Edelstein effect.

Tapas Senapati1, Ashwin Kumar Karnad2, Kartik Senapati3

  • 1School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, An OCC of Homi Bhabha National Institute, Jatni, 752050, Odisha, India.

Nature Communications
|November 17, 2023
PubMed
Summary
This summary is machine-generated.

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Researchers detected the Rashba-Edelstein effect at interfaces using Josephson junctions. This method directly measures spin moments, offering new insights into spin-orbit interactions and potential applications in quantum circuits.

Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Quantum Information Science

Background:

  • The Rashba-Edelstein effect generates spin density at interfaces due to charge current.
  • Direct detection of this interfacial spin moment is challenging.
  • Spin-orbit interactions are crucial for next-generation electronics and quantum computing.

Purpose of the Study:

  • To demonstrate a novel method for directly detecting the Rashba-Edelstein spin moment.
  • To utilize Josephson junctions for probing interfacial spin polarization.
  • To explore potential applications in superconducting quantum circuits.

Main Methods:

  • Fabrication of planar Josephson junctions using superconducting electrodes (Nb) on a Rashba interface (Pt/Cu).
  • Measurement of asymmetric Fraunhofer patterns in nano-junctions.

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  • Analysis of the phase shift induced by the Rashba-Edelstein spin moment.

    • Main Results:

    • Observed asymmetric Fraunhofer patterns in Nb-(Pt/Cu)-Nb nano-junctions.
    • Attributed asymmetry to the locking of the Rashba-Edelstein spin moment to the flux quantum.
    • Provided clear signatures for the direct detection of interfacial spin polarization.

    Conclusions:

    • A planar Josephson junction provides a direct detection method for the Rashba-Edelstein effect.
    • This technique offers a new perspective on detecting spin polarization from various spin-orbit effects.
    • The platform enables magnetic-field-controlled phase biasing for superconducting quantum circuits.