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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Optical absorption in atomically thin materials is primarily driven by excitonic transitions.
  • Band topology near material valleys significantly influences optical selection rules.

Purpose of the Study:

  • To propose and theoretically investigate a method for probing gate-controlled band topology.
  • To explore the relationship between band ordering, valley winding number, and excitonic transitions.

Main Methods:

  • Utilizing an effective Hamiltonian and Bethe-Salpeter equation for accurate exciton description.
  • Employing first-principles calculations to validate theoretical predictions.
  • Analyzing helicity-resolved absorption and photoluminescence spectra.

Main Results:

  • Demonstrated that gate-controlled band ordering can tune valley winding numbers.
  • Showed that these topological changes directly impact excitonic transitions.
  • Predicted the experimental observability of these phenomena in specific material systems.

Conclusions:

  • Gate-controlled band topology offers a novel pathway to manipulate excitonic properties in 2D materials.
  • Helicity-resolved optical spectroscopy is a viable technique for probing these topological effects.
  • Antimony-based monolayers are promising candidates for realizing this tunable band topology.