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Multi-terminal Josephson junctions as topological matter.

Roman-Pascal Riwar1,2, Manuel Houzet1,2, Julia S Meyer1,2

  • 1University of Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.

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|April 5, 2016
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Summary
This summary is machine-generated.

Novel topological phenomena can be realized in multi-terminal Josephson junctions. These systems exhibit Weyl singularities, enabling topological transitions and quantized transconductance changes in higher dimensions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Topological materials exhibit unique transport properties crucial for modern research.
  • Their topology, derived from band structure, is difficult to tune and limited to 3D.
  • Existing topological materials are restricted in dimensionality and tunability.

Purpose of the Study:

  • To explore novel realizations of topology in higher dimensions using Josephson junctions.
  • To investigate the potential of n-terminal Josephson junctions for creating tunable topological states.
  • To understand the relationship between superconducting phase differences and topological properties.

Main Methods:

  • Theoretical investigation of n-terminal Josephson junctions with conventional superconductors.
  • Analysis of the Andreev subgap spectrum for Weyl singularities.
  • Experimental observation of topological transitions via quantized transconductance measurements.

Main Results:

  • Demonstrated that n-terminal Josephson junctions can host topology in n-1 dimensions.
  • Identified Weyl singularities in the superconducting phase space for n>=4.
  • Observed topological transitions manifesting as quantized transconductance changes (4e^2/h).

Conclusions:

  • Multi-terminal Josephson junctions offer a new platform for realizing and controlling topological states.
  • The superconducting phase space acts as a tunable "quasimomentum" for topological phenomena.
  • This work opens avenues for exploring higher-dimensional topology in condensed matter systems.