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Mapping the Topological Proximity-Induced Gap in Multiterminal Josephson Junctions.

M Wisne1, Y Deng1, I M A Lilja2

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Researchers explored multiterminal Josephson junctions (MTJJs) as topological crystals. Measuring MTJJ resistance revealed topological modulations in quasiparticle density of states, offering a new technique for studying topological physics.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • Multitermerminal Josephson junctions (MTJJs) are proposed as artificial topological crystals.
  • The topological properties of MTJJs are linked to modulations in the quasiparticle density of states (DOS) within the normal metal.
  • These modulations are theoretically probeable via tunneling measurements.

Purpose of the Study:

  • To demonstrate a practical method for revealing topological effects in MTJJs.
  • To investigate the relationship between MTJJ resistance and phase differences.
  • To establish a technique for probing the quasiparticle DOS modulation.

Main Methods:

  • Fabrication and measurement of diffusive multiterminal Josephson junctions (MTJJs).
  • Utilizing normal contacts for resistance measurements.
  • Analyzing the resistance as a function of superconducting phase differences ({í_i}).

Main Results:

  • Observed rich structure in the resistance of diffusive MTJJs.
  • Demonstrated that resistance measurements can reveal topological modulations in the quasiparticle DOS.
  • Established a correlation between resistance variations and phase differences.

Conclusions:

  • Resistance measurements provide a simple and powerful technique for exploring topological effects in MTJJs.
  • The study validates MTJJs as platforms for studying topological phenomena.
  • The findings open avenues for further research into topological quantum devices.