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Enrique Arévalo Rodríguez1,2, Marc Meléndez1,2, Jorge Cuadra1,2

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Transient scattering microscopy (TScM) reveals non-Gaussian exciton populations in transition metal dichalcogenides (TMDCs). Analyzing excess kurtosis offers a vital diagnostic for anomalous diffusion, improving upon traditional Gaussian fits.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spectroscopy

Background:

  • Transient microscopy enables high-resolution imaging of charge carrier dynamics.
  • Gaussian fits for population broadening can misinterpret coexisting species.
  • Transient scattering microscopy (TScM) is sensitive to diverse species, highlighting limitations of Gaussian fits.

Purpose of the Study:

  • To visualize exciton transport in bulk transition metal dichalcogenides (TMDCs) using TScM.
  • To investigate the non-Gaussian nature of exciton populations.
  • To establish kurtosis as a diagnostic parameter for anomalous diffusion and improve TScM data analysis.

Main Methods:

  • Utilized TScM to image exciton transport in bulk TMDCs.
  • Analyzed exciton population profiles using excess kurtosis.
  • Performed simulations incorporating anomalous diffusion.
  • Implemented discrete variable calculations to extract variances.

Main Results:

  • Exciton populations in bulk TMDCs exhibit non-Gaussian profiles.
  • Kurtosis analysis distinguishes between coexisting populations and trap-dominated regimes.
  • Discrete variable calculations yield robust diffusivity values where Gaussian fits fail.
  • Simulations confirm kurtosis as a signature of anomalous diffusion.

Conclusions:

  • Excess kurtosis is a vital diagnostic parameter for identifying anomalous diffusion in TScM data.
  • Moving beyond Gaussian approximations is necessary for accurate TScM data analysis.
  • This work provides a more robust method for quantifying exciton transport and diffusivity in TMDCs.