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Updated: Jul 11, 2025

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Ballistic PbTe Nanowire Devices.

Yuhao Wang1, Fangting Chen1, Wenyu Song1

  • 1State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.

Nano Letters
|November 10, 2023
PubMed
Summary

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This summary is machine-generated.

Researchers developed ballistic lead telluride (PbTe) nanowire devices using selective-area-growth. These nanowires show quantized conductance at zero magnetic field, reducing disorder and lifting valley degeneracy for Majorana fermion research.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Disorder in Majorana nanowire experiments hinders progress.
  • Achieving ballistic transport is crucial for reliable Majorana searches.
  • Quantized conductance plateaus are key indicators of low disorder and ballistic transport.

Purpose of the Study:

  • To develop novel nanowire devices for reducing disorder in Majorana experiments.
  • To investigate ballistic transport properties in lead telluride (PbTe) nanowires.
  • To assess the potential of PbTe nanowires for Majorana fermion realization.

Main Methods:

  • Utilizing the selective-area-growth (SAG) technique to fabricate PbTe nanowires.
  • Measuring quantized conductance plateaus in the fabricated nanowire devices.
Keywords:
PbTeballistic transportconductance quantizationnanowires

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  • Analyzing the observed plateau values to understand electronic properties like valley degeneracy.

    • Main Results:

    • Successfully grew ballistic PbTe nanowire devices using SAG.
    • Observed quantized conductance plateaus in units of 2e²/h at zero magnetic field.
    • Demonstrated lifting of valley degeneracy in PbTe nanowires, a significant advancement.

    Conclusions:

    • SAG-grown PbTe nanowires offer a promising platform for reducing disorder in quantum transport experiments.
    • The observed zero-field ballistic transport and lifted valley degeneracy in PbTe nanowires are crucial steps towards Majorana realization.
    • These nanowires could facilitate the search for clean signatures of the spin-orbit helical gap.