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Radiative pattern of intralayer and interlayer excitons in two-dimensional WS2/WSe2 heterostructure.

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This study investigates interlayer excitons in 2D transition-metal dichalcogenide heterostructures. Angle-resolved spectroscopy reveals their out-of-plane dipole orientation, crucial for optoelectronics and quantum coherence studies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Two-dimensional (2D) heterostructures (HS) from transition-metal dichalcogenide (TMDC) monolayers enable study of excitons and moiré patterns.
  • Dipolar charge-transfer excitons, with electrons and holes in separate layers, are significant for optoelectronics and Bose-Einstein condensation.

Purpose of the Study:

  • To demonstrate the out-of-plane dipole orientation of interlayer excitons in TMDC heterostructures.
  • To differentiate interlayer excitons from intralayer excitons and moiré-induced features.

Main Methods:

  • Angle-resolved photoluminescence spectroscopy at cryogenic temperatures.
  • Utilizing a tungsten-based TMDC heterostructure.

Main Results:

  • The radiation profile of interlayer excitons was directly obtained.
  • Interlayer excitons exhibit an in-plane emitter-like radiation profile, distinct from intralayer bright excitons.
  • This profile differs from excitonic features attributed to moiré superlattices.

Conclusions:

  • The study confirms the out-of-plane dipole orientation of interlayer excitons in TMDC HS.
  • Findings are vital for advancing applications in optoelectronics and exploring quantum coherence phenomena.