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Multiterminal Inverse AC Josephson Effect.

Ethan G Arnault1, Trevyn F Q Larson1, Andrew Seredinski1,2

  • 1Department of Physics, Duke University, Durham, North Carolina 27708, United States.

Nano Letters
|November 15, 2021
PubMed
Summary
This summary is machine-generated.

Researchers studied the multiterminal inverse AC Josephson effect in a graphene device. They observed fractional Shapiro steps and correlated switching, revealing complex behavior in highly connected superconducting networks.

Keywords:
AC Josephson EffectDriven-Dissipative SystemsShapiro StepsSuperconductivityTopological Materials

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Area of Science:

  • Superconducting electronics
  • Quantum phenomena
  • Materials science

Background:

  • Josephson junctions exhibit the inverse AC Josephson effect when exposed to microwave radiation, leading to quantized voltage Shapiro steps.
  • Multiterminal Josephson junctions involve complex phase spaces due to coupling between multiple superconducting contacts.

Purpose of the Study:

  • Investigate the multiterminal inverse AC Josephson effect in a graphene device with three superconducting terminals.
  • Analyze the emergent phenomena in highly connected Josephson networks.

Main Methods:

  • Fabrication of a graphene sample with three superconducting terminals.
  • Experimental observation of Shapiro steps under microwave irradiation.
  • Simulation using a modified two-dimensional Resistively and Capacitively Shunted Junction (RCSJ) model.

Main Results:

  • Observation of robust fractional Shapiro steps in the graphene Josephson junction.
  • Detection of correlated switching events between different terminals.
  • Successful simulation of experimental results using the modified RCSJ model, validating the network behavior.

Conclusions:

  • Multiterminal Josephson junctions behave as fully connected networks, exhibiting complex nonlinear dynamics.
  • Fractional Shapiro steps and correlated switching are key signatures of these highly connected superconducting networks.
  • Graphene-based multiterminal Josephson junctions offer a platform for exploring novel network topologies and quantum phenomena.