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Competitive helical bands and highly efficient diode effect in F/S/TI/S/F hybrid structures.

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Summary
This summary is machine-generated.

Researchers designed a novel superconducting diode with tunable polarity and high efficiency. This mesoscopic device utilizes two superconducting islands on a topological insulator, offering controllable current flow for advanced electronic applications.

Keywords:
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Area of Science:

  • Condensed matter physics
  • Quantum electronics
  • Materials science

Background:

  • The superconducting diode effect, enabling non-reciprocal current flow, is a key area of research.
  • Existing devices often lack tunable polarity or high efficiency.

Purpose of the Study:

  • To propose and theoretically investigate a novel mesoscopic superconducting device exhibiting a tunable-polarity diode effect.
  • To achieve high efficiency in superconducting diode operation.

Main Methods:

  • Utilized the quasiclassical formalism of the Usadel equations.
  • Modeled a device comprising two superconducting islands with proximity-induced ferromagnetism on a 3D topological insulator.

Main Results:

  • Demonstrated controllable polarity of the diode efficiency via magnetization tuning of a single superconducting island.
  • Showed a substantial increase in diode efficiency.
  • Attributed efficiency enhancement to competing supercurrent contributions from the two islands, linked via topological insulator surface states.

Conclusions:

  • The proposed device offers a promising platform for highly efficient superconducting diodes with controllable polarity.
  • The design leverages the unique properties of topological insulators and proximity-induced ferromagnetism.