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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Atomically reconstructed MoSe2/WSe2 heterobilayers are promising for optoelectronic applications.
  • Disorder and moiré potentials typically hinder interlayer exciton transport.
  • Understanding exciton dynamics is crucial for designing advanced devices.

Purpose of the Study:

  • To investigate interlayer exciton diffusion in low-disorder MoSe2/WSe2 heterobilayers.
  • To determine the factors influencing exciton propagation and dynamics.
  • To explore the transition between exciton and electron-hole plasma regimes.

Main Methods:

  • Fabrication of atomically reconstructed MoSe2/WSe2 heterobilayers with suppressed disorder.
  • Optical absorption, circularly polarized photoluminescence, and g-factor measurements for structural confirmation.
  • Transient absorption microscopy to study exciton propagation.
  • Temperature-dependent measurements and simulations to analyze diffusion and interactions.

Main Results:

  • Confirmed local atomic registry and suppressed disorder in the heterobilayers.
  • Observed interlayer exciton diffusion independent of trapping potentials.
  • Measured linear diffusion coefficients nearly 1000 times higher than previously reported.
  • Quantified contributions of exciton-exciton repulsion and annihilation to nonlinear propagation.
  • Demonstrated effective shrinking of light emission area, indicating a transition to plasma-dominated regimes.

Conclusions:

  • Atomically precise heterobilayers enable ultra-fast interlayer exciton diffusion.
  • Exciton transport is governed by intrinsic properties rather than extrinsic disorder.
  • Exciton-exciton interactions and plasma effects significantly impact exciton dynamics.
  • The study provides insights into the transient behavior of excitons and electron-hole plasmas.