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Electrically Controlled Crossed Andreev Reflection in Two-Dimensional Antiferromagnets.

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We demonstrate tunable crossed Andreev reflection (CAR) in superconductor-antiferromagnet heterostructures. This magnetic field-free effect is electrically controlled, paving the way for quantum entanglement applications.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Spintronics

Background:

  • Crossed Andreev reflection (CAR) is a quantum mechanical phenomenon crucial for spintronics.
  • Superconductor-antiferromagnet heterostructures offer tunable electronic properties.

Purpose of the Study:

  • To investigate generic and tunable CAR in superconductor sandwiched between two antiferromagnetic layers.
  • To explore the potential of two-dimensional magnets for robust CAR signatures.

Main Methods:

  • Theoretical modeling of CAR in superconductor-antiferromagnet heterostructures.
  • Utilizing gate voltages to control carrier type and density in 2D magnets.
  • Analyzing nonlocal differential conductance for CAR signatures.

Main Results:

  • Predicted a robust signature of perfect CAR in nonlocal differential conductance.
  • Demonstrated electrically controlled, magnetic field-free, and spin-degenerate CAR.
  • Observed CAR signal over a large voltage range.

Conclusions:

  • The proposed system provides a generic and tunable platform for CAR.
  • Electrically controlled CAR shows promise for solid-state quantum entanglement applications.