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Evidence for Helical Hinge Zero Modes in an Fe-Based Superconductor.

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Researchers found evidence that FeTe0.55Se0.45 (FTS) is a higher-order topological superconductor. This discovery opens new avenues for fundamental physics and fault-tolerant quantum computing.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Computing

Background:

  • Combining topology and superconductivity offers pathways for fundamental physics research and fault-tolerant quantum computing.
  • FeTe0.55Se0.45 (FTS) is a material with mounting evidence suggesting it is topologically nontrivial.

Purpose of the Study:

  • To investigate the potential of FTS as a higher-order topological superconductor.
  • To experimentally verify the presence of helical hinge zero modes (HHZMs) in FTS.

Main Methods:

  • Fabrication of normal-metal/superconductor junctions on different surfaces using 2D atomic crystal heterostructures.
  • Tunneling spectroscopy measurements on FTS surfaces and bulk samples.
  • Analysis of zero bias anomalies and their temperature dependence.

Main Results:

  • Sharp zero bias anomalies were observed in junctions contacting the hinge of FTS, but not when tunneling along the c-axis.
  • The observed anomalies' characteristics (shape, temperature suppression) align with predictions for highly coherent hinge modes.
  • Measurements on bulk samples confirmed the intrinsic nature of the observed modes.

Conclusions:

  • The experimental results provide strong evidence that FTS is a higher-order topological superconductor.
  • The findings support the existence of helical hinge zero modes in FTS.
  • This research advances the understanding of topological superconductors and their potential applications.