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Enhanced Superconducting Diode Effect due to Coexisting Phases.

Sayan Banerjee1, Mathias S Scheurer1

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Researchers developed a new theory explaining the superconducting diode effect, enhancing critical current asymmetry in junction-free systems. This breakthrough may explain recent experiments and enable future devices with significant asymmetry.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • The superconducting diode effect describes critical supercurrent asymmetry in opposite directions (Jc(n≠Jc(-n)).
  • Existing theoretical models struggle to explain large asymmetries observed in junction-free systems.

Purpose of the Study:

  • To propose and develop a theory for an enhanced superconducting diode effect mechanism.
  • To investigate the role of spontaneous symmetry breaking in current asymmetry.

Main Methods:

  • Developed both phenomenological and microscopic theories.
  • Investigated the coupling between supercurrent and symmetry-breaking order parameters.

Main Results:

  • Identified a coupling mechanism that significantly enhances current asymmetry.
  • Demonstrated that spontaneous symmetry breaking is key to this enhancement.

Conclusions:

  • The proposed theory provides a potential explanation for recent experimental observations in trilayer graphene.
  • This work paves the way for realizing superconducting diode effects with large current asymmetries in future devices.