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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Quantum Materials

Background:

  • Bardeen-Cooper-Schrieffer (BCS) superfluidity and Bose-Einstein condensation (BEC) represent distinct quantum ground states of paired fermions.
  • Understanding the transition between these states is crucial for fundamental physics and potential applications.

Purpose of the Study:

  • To investigate the crossover behavior between BCS superfluidity and BEC in a two-dimensional superconductor.
  • To explore the feasibility of using a gate-doped semiconductor as a platform for studying the BCS-BEC crossover.

Main Methods:

  • Fabrication and characterization of electron-doped zirconium nitride chloride as a two-dimensional superconductor.
  • Utilizing ionic gating to systematically vary carrier density.
  • Simultaneous measurements of electrical resistivity and tunneling spectra to establish the phase diagram.

Main Results:

  • Demonstrated a crossover from the BCS to the BEC limit by tuning carrier density.
  • Identified a pseudogap phase in the low-doping regime.
  • Observed a superconducting transition temperature to Fermi temperature ratio consistent with theoretical predictions for the BCS-BEC crossover regime.

Conclusions:

  • Electron-doped zirconium nitride chloride serves as an ideal platform for studying the two-dimensional BCS-BEC crossover.
  • The observed behavior provides experimental validation for theories on fermionic superfluidity and condensation.
  • This system offers a simplified approach to BCS-BEC crossover studies compared to other solid-state systems.