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High-mobility bismuth oxyselenide nanoribbons exhibit quantized conductance up to 44×2e^{2}/h due to a hidden Rashba effect. This effect maintains quantized conductance without Zeeman splitting in magnetic fields, paving the way for spintronics.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena
  • Materials Science

Background:

  • Quantized conductance in quasi-one-dimensional systems indicates ballistic transport and enables quantum exploration.
  • A hidden Rashba effect in specific crystals like bismuth oxyselenide (Bi_{2}O_{2}Se) is of recent interest but challenging to study via conductance quantization.

Purpose of the Study:

  • To investigate conductance quantization in high-mobility Bi_{2}O_{2}Se nanoribbons.
  • To explore the influence of the hidden Rashba effect on quantized conductance.
  • To demonstrate Bi_{2}O_{2}Se as a platform for spintronics.

Main Methods:

  • Fabrication of high-mobility Bi_{2}O_{2}Se nanoribbons using chemical vapor deposition (CVD).
  • Measurement of quantized conductance at zero and applied magnetic fields.
  • Analysis of conductance plateau sequences and comparison with theoretical models.

Main Results:

  • Quantized conductance plateaus up to 44×2e^{2}/h were observed at zero magnetic field.
  • The hidden Rashba effect preserved quantized conductance in multiples of 2e^{2}/h without Zeeman splitting up to 12 T.
  • A specific magnetic field range showed a plateau sequence following the Pascal triangle series, indicating interplay of transverse size quantization.

Conclusions:

  • Bi_{2}O_{2}Se nanoribbons exhibit unique quantized conductance phenomena driven by the hidden Rashba effect.
  • The observed phenomena are consistent with an effective hidden Rashba bilayer model.
  • Bi_{2}O_{2}Se is a promising material for spintronics and studying emergent quantum phenomena.