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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Current valleytronics relies on time-reversal-connected valleys in 2D hexagonal materials.
  • This paradigm limits electric control over valley polarization using gate fields.

Purpose of the Study:

  • To explore a new valley-layer coupling (VLC) mechanism in 2D systems.
  • To enable direct electric control of valley polarization and explore associated phenomena.

Main Methods:

  • Analysis of symmetry requirements for VLC.
  • First-principles calculations and model analysis of 2D materials.
  • Demonstration of electric control over valley polarization.

Main Results:

  • Identified a novel valley-layer coupling (VLC) mechanism.
  • Achieved electric, continuous, wide-range, and switchable control of valley polarization.
  • Observed valley-contrasting linear dichroism and optical selection of valley/exciton polarization.

Conclusions:

  • The VLC mechanism overcomes limitations of existing valleytronics paradigms.
  • This finding opens new research directions for valleytronics and 2D materials.
  • VLC facilitates novel electronic and optical properties in 2D systems.