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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene phononic crystals (GPnCs) offer tunable thermal properties.
  • Understanding phonon transport mechanisms is crucial for thermal management.

Purpose of the Study:

  • To provide direct numerical evidence of coherent phonon participation in thermal transport in GPnCs at room temperature.
  • To evaluate the contribution of coherent phonons to thermal conductivity.
  • To investigate the effects of structural modifications and temperature on coherent phonon transport.

Main Methods:

  • Nonequilibrium molecular dynamics simulations.
  • Two-phonon model for thermal conductivity evaluation.
  • Phonon wave-packet simulations to study localization.

Main Results:

  • Direct numerical evidence of coherent phonons contributing to thermal transport in GPnCs at room temperature.
  • Observed transition from incoherent to coherent phonon transport with decreasing GPnC period length.
  • Demonstrated significant reduction in thermal conductivity and suppressed length dependence due to coherent phonon localization induced by random perturbations.

Conclusions:

  • Coherent phonons play a significant role in thermal transport in GPnCs.
  • Phonon localization is an effective mechanism for reducing thermal conductivity in phononic structures.
  • This work provides insights for engineering thermal transport through phonon localization in periodic structures.