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Highly tunable band structure in ferroelectric R-stacked bilayer WSe2.

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This summary is machine-generated.

We explored rhombohedral stacked WSe2, revealing its ferroelectric properties and type-II band alignment. This work provides key parameters for understanding twisted bilayers and developing new quantum electronic devices.

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Area of Science:

  • Quantum Materials
  • Condensed Matter Physics
  • 2D Materials

Background:

  • Transition metal dichalcogenide homobilayers combine ferroelectricity and moiré quantum matter.
  • Rhombohedral stacking in these materials leads to spontaneous polarization and tunable band structures.

Purpose of the Study:

  • To systematically study the electronic and ferroelectric properties of rhombohedral stacked bilayer WSe2.
  • To quantitatively establish fundamental parameters for twisted bilayer systems.

Main Methods:

  • Low-temperature optical spectroscopy (exciton and exciton-polaron spectroscopy).
  • Application of doping and displacement fields.
  • Analysis of excitonic responses and band structure.

Main Results:

  • Confirmed type-II band alignment with distinct electron-hole asymmetry.
  • Uncovered coexistence of AB and BA ferroelectric domains.
  • Measured intrinsic polarization field and interlayer potential using exciton-polarons.
  • Demonstrated electric-field-driven switching of the valence band maximum.

Conclusions:

  • Provided a comprehensive experimental understanding of band alignment, polarization, and domain dynamics in rhombohedral stacked WSe2.
  • Established crucial parameters for the study of twisted bilayers.
  • Opened avenues for novel ferroelectric and excitonic device applications.