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Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions.

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This summary is machine-generated.

Researchers observed a topological phase transition in a Josephson junction. Gap reopening and zero-bias conductance peaks indicate this transition, with implications for topological quantum computing.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Nanoscale Electronics

Background:

  • Josephson junctions are crucial for quantum electronics.
  • Understanding topological phase transitions is key for quantum computing.
  • Hybrid heterostructures offer tunable quantum properties.

Purpose of the Study:

  • To investigate the transport properties of a phase-biased planar Josephson junction.
  • To explore the relationship between magnetic field, phase bias, and carrier density on junction conductance.
  • To identify signatures of topological phase transitions and their origins.

Main Methods:

  • Simultaneous acquisition of local and nonlocal transport spectroscopy.
  • Utilized quantum point contacts for precise conductance measurements.
  • Varied magnetic field, phase difference, and carrier density to probe junction behavior.

Main Results:

  • Observed a closing and reopening of the energy gap in both local and nonlocal tunneling spectra with applied magnetic field.
  • Identified zero-bias conductance peaks (ZBCPs) in local conductances during gap reopenings at specific carrier densities.
  • Found strong correlation in gap reopening but weak correlation in local ZBCPs across the junction.

Conclusions:

  • The observed conductance matrix behavior is consistent with a topological phase transition.
  • Phase dependence of ZBCPs aids in distinguishing their underlying physical mechanisms.
  • The findings provide insights into controlling and understanding topological states in hybrid superconducting systems.