Polarity-Reversible Zero-Field Diode Effect in van der Waals Ferromagnetic Josephson Junction for Logic Operation.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Computing

Background:

• Superconducting electronics offer high energy efficiency and quantum-ready properties.
• Nonreciprocal circuit elements, like superconducting diodes, are crucial for quantum processors and sensors.
• Developing practical, polarity-tunable superconducting diodes for zero magnetic field operation is a significant challenge.

Purpose of the Study:

• To demonstrate a polarity-reversible zero-field Josephson diode effect (JDE).
• To explore the tunability of diode characteristics in a 2D van der Waals (vdW) heterostructure.
• To assess the potential for implementing logic operations using the reconfigurable JDE.

Main Methods:

• Fabrication of a vertically stacked 2D vdW Josephson junction using NbSe2 (superconductor) and Fe3GeTe2 (ferromagnet).
• Investigation of the Josephson diode effect and its tunability via the magnetic state and thickness of the Fe3GeTe2 layer.
• Experimental implementation of an exclusive OR (XOR) logic gate.

Main Results:

• Demonstration of a polarity-reversible zero-field JDE with sustained performance.
• Diode asymmetry and rectification polarity successfully tuned by the magnetic state and thickness of the Fe3GeTe2 layer.
• Achieved a rectification efficiency of up to 34.1% with polarity reversibility.
• Successful operation of an XOR logic gate using the reconfigurable JDE.

Conclusions:

• Established a new pathway for creating efficient, polarity-reversible, zero-field superconducting diodes.
• Highlighted the potential of 2D vdW heterostructures for non-dissipative superconducting electronics.
• The reconfigurable JDE offers promising applications in next-generation computing architectures.