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Researchers demonstrate a new method for achieving topological superconductivity (TSC) in hybrid nanowires. Applying magnetic flux to a superconducting shell induces Majorana zero modes, crucial for quantum computing applications.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum computing

Background:

  • Hybrid semiconductor-superconductor nanowires are a key platform for exploring topological superconductivity.
  • Topological superconductivity (TSC) is of great interest for realizing robust quantum information processing.

Purpose of the Study:

  • To present a novel route to induce topological superconductivity (TSC) in hybrid nanowires.
  • To investigate the role of magnetic flux and superconducting phase winding in achieving TSC.
  • To confirm the presence of Majorana zero modes.

Main Methods:

  • Fabrication of hybrid semiconductor-superconductor nanowires with a full superconducting shell.
  • Application of controlled magnetic flux through the nanowire core.
  • Tunneling spectroscopy to probe the induced energy gap.
  • Analysis of Coulomb blockade peak spacing for length dependence.

Main Results:

  • A hard induced gap was observed near zero magnetic flux, indicating zero phase winding.
  • A gapped region with a discrete zero-energy state emerged around one flux quantum, signifying 2π phase winding.
  • Theoretical analysis confirmed that superconducting phase winding can induce a topological phase transition.
  • Measured Coulomb blockade peak spacing exhibited length dependence consistent with Majorana modes.

Conclusions:

  • The study successfully demonstrates a method to achieve topological superconductivity in hybrid nanowires using magnetic flux.
  • The findings provide strong evidence for the existence of Majorana zero modes at the nanowire ends.
  • This work advances the development of platforms for topological quantum computing.