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Phonon hydrodynamics in two-dimensional materials.

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  • 11] Theory and Simulations of Materials (THEOS), École Polytechnique Fédérale de Lausanne, Station 12, 1015 Lausanne, Switzerland [2] National Center for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, Station 12, 1015 Lausanne, Switzerland.

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Summary
This summary is machine-generated.

Heat transport in 2D materials like graphene shows unique behaviors. Normal processes dominate over Umklapp scattering, enabling wave-like heat diffusion and second sound even at room temperature.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials exhibit unique thermal transport properties.
  • Understanding heat conduction in 2D systems is crucial for advanced technological applications.
  • Graphene and related materials are prime candidates for novel electronic and thermal devices.

Purpose of the Study:

  • To investigate phonon transport and heat conductivity in various 2D materials from first principles.
  • To explore the dominance of normal scattering processes over Umklapp scattering at higher temperatures.
  • To identify the emergence of novel hydrodynamic regimes and wave-like heat diffusion.

Main Methods:

  • Utilizing density-functional perturbation theory (DFPT).
  • Employing an exact, variational solution of the Boltzmann transport equation (BTE).
  • First-principles calculations for phonon transport and thermal conductivity.

Main Results:

  • Normal scattering processes dominate over Umklapp scattering up to room temperature in graphene, boron nitride, molybdenum disulfide, graphane, and fluorographene.
  • Poiseuille and Ziman hydrodynamic regimes, typically seen at cryogenic temperatures, are observed at ordinary conditions.
  • Wave-like heat diffusion, including second sound, is present at room temperature and above in several 2D materials.

Conclusions:

  • 2D materials display distinct thermal transport characteristics compared to 3D solids.
  • Novel hydrodynamic transport phenomena are prevalent in these materials at ambient temperatures.
  • The presence of second sound in 2D materials opens new avenues for thermal management and energy transport.