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Area of Science:

  • Condensed Matter Physics
  • Superconducting Spintronics
  • Quantum Phenomena

Background:

  • Standard Josephson junctions exhibit zero supercurrent at zero phase difference, protected by symmetry.
  • Spin-orbit coupling and magnetic fields break these symmetries, enabling anomalous Josephson effects.
  • The anomalous Josephson effect is crucial for superconducting spintronics and topological superconductivity.

Purpose of the Study:

  • To experimentally observe and control the anomalous Josephson effect.
  • To demonstrate gate-tunable spin-orbit coupling in InAs/Al Josephson junctions.
  • To explore new avenues for superconducting spintronics and topological superconductivity.

Main Methods:

  • Fabrication of InAs/Al Josephson junctions.
  • Measurement using a superconducting quantum interference device (SQUID).
  • Gate voltage control to tune InAs carrier density and spin-orbit coupling strength.

Main Results:

  • Observation of a tunable anomalous Josephson effect.
  • Demonstration of gate-controlled anomalous phase shift.
  • Correlation between InAs density, spin-orbit coupling, and anomalous phase.

Conclusions:

  • The tunable anomalous Josephson effect is achievable in InAs/Al systems.
  • Gate-tunable spin-orbit coupling offers precise control over superconducting spintronic properties.
  • This work paves the way for novel superconducting spintronic devices and topological quantum computations.