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Quantum Griffiths Singularity in Ordered Artificial Superconducting-Islands-Array on Graphene.

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Researchers experimentally verified the Quantum Griffiths phase (QGP) in artificial superconducting islands on graphene. This provides visual evidence for quantum Griffiths singularity (QGS) in disordered superconducting systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • The Quantum Griffiths phase (QGP) describes quantum phase transitions in 2D superconductors.
  • The Quantum Griffiths singularity (QGS) theoretically predicts inhomogeneous superconducting rare regions.
  • Experimental verification of these rare regions remains a challenge.

Purpose of the Study:

  • To experimentally demonstrate the Quantum Griffiths singularity (QGS) in an artificial system.
  • To provide visual evidence for the emergence of superconducting rare regions.
  • To explore the universal features of QGP in heterostructured systems.

Main Methods:

  • Fabrication of an artificial ordered superconducting-islands-array on monolayer graphene using an anodic aluminum oxide (AAO) membrane.
  • Investigation of QGS under both in-plane and out-of-plane magnetic fields.
  • Analysis of the dynamical critical exponent and activated scaling behavior.

Main Results:

  • Experimental evidence for QGS in the artificial graphene system.
  • Observation of direct activated scaling behavior.
  • Phase diagram confirms QGP emergence in rare superconducting regions with vanished quantum coherence.

Conclusions:

  • The study provides the first intuitive experimental verification of superconducting rare regions.
  • It demonstrates universal features of QGP in artificial heterostructures.
  • Offers a visualized platform for theoretical QGS proposals.