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Spatio-temporal dynamics in graphene.

Roland Jago1, Raül Perea-Causin1, Samuel Brem1

  • 1Chalmers University of Technology, Department of Physics, SE-412 96 Gothenburg, Sweden. ermin.malic@chalmers.se.

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Summary
This summary is machine-generated.

We investigated carrier diffusion in graphene, finding a diffusion coefficient of 360 cm² s⁻¹. Phonon scattering causes back-diffusion, impacting carrier distribution in graphene optoelectronics.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Optoelectronics

Background:

  • Carrier diffusion in graphene is crucial for optoelectronic applications.
  • Spatio-temporal carrier dynamics in graphene are not well understood.
  • Microscopic understanding of carrier transport is needed.

Purpose of the Study:

  • To provide microscopic insight into time-, momentum-, and space-resolved carrier dynamics in graphene.
  • To quantify the carrier diffusion coefficient in graphene.
  • To elucidate the roles of carrier-phonon and carrier-carrier scattering in graphene carrier diffusion.

Main Methods:

  • Theoretical modeling of carrier dynamics in graphene.
  • Analysis of time-, momentum-, and space-resolved carrier behavior.
  • Calculation of the diffusion coefficient and scattering effects.

Main Results:

  • Determined the carrier diffusion coefficient in graphene to be approximately 360 cm² s⁻¹.
  • Identified significant impacts of carrier-phonon and carrier-carrier scattering on diffusion.
  • Observed phonon-induced scattering across the Dirac cone leading to back-diffusion.

Conclusions:

  • Carrier diffusion in graphene is significantly influenced by scattering mechanisms.
  • Back-diffusion due to phonon scattering counteracts spatial carrier distribution broadening.
  • This research offers a microscopic view of carrier dynamics vital for graphene-based optoelectronics.