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Valley-dimensionality locking of superconductivity in cubic phosphides.

Lingyi Ao1, Junwei Huang1, Feng Qin1

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Researchers developed a new method to create tunable two-dimensional superconductors in bulk arsenic phosphides using hydrostatic pressure. This approach offers better control over superconducting properties by engineering the electronic structure (Fermiology).

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Two-dimensional superconductivity is typically achieved using challenging methods like exfoliation or epitaxial growth.
  • Existing techniques offer limited control over the electronic properties (Fermiology) of superconducting materials.
  • Achieving 2D superconductivity in bulk materials remains a significant challenge.

Purpose of the Study:

  • To introduce a Fermiology-engineering approach for controlling superconducting states.
  • To investigate the pressure-induced transition to two-dimensional superconductivity in arsenic phosphides (AsP1-x).
  • To understand the underlying mechanism responsible for tunable dimensionality in bulk superconductors.

Main Methods:

  • Applying hydrostatic pressure to bulk arsenic phosphide (AsP1-x) compounds.
  • Utilizing a Fermiology-engineering strategy to tune electronic band structures.
  • Analyzing the pressure-dependent superconducting phase diagram and electronic properties.

Main Results:

  • Arsenic phosphides exhibit tunable two-dimensional superconductivity in the bulk limit under hydrostatic pressure.
  • A dome-shaped superconducting phase diagram was observed, indicating a transition to 2D behavior.
  • An unconventional valley-dimensionality locking mechanism, driven by competing electronic pockets, was identified.

Conclusions:

  • Hydrostatic pressure provides a novel route to achieve and control 2D superconductivity in bulk materials.
  • The Fermiology-engineering approach offers precise tuning of Cooper pair coherence length and superconducting dimensionality.
  • This work opens new avenues for designing and manipulating superconductors with tailored pairing and dimensional orders.