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Related Experiment Videos

Super-Planckian Electron Cooling in a van der Waals Stack.

Alessandro Principi1, Mark B Lundeberg2, Niels C H Hesp2

  • 1Radboud University, Institute for Molecules and Materials, NL-6525 AJ Nijmegen, The Netherlands.

Physical Review Letters
|April 8, 2017
PubMed
Summary

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Radiative heat transfer between closely spaced materials is highly efficient due to evanescent electromagnetic modes. This study shows extremely efficient heat transfer between graphene and hexagonal boron nitride (hBN) at room temperature.

Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Radiative heat transfer (RHT) between macroscopic bodies is typically described by the Stefan-Boltzmann law for far-field interactions.
  • At sub-wavelength separations, evanescent electromagnetic modes dominate RHT, enabling significantly enhanced heat transfer rates.
  • Understanding near-field RHT is crucial for thermal management in nanoscale devices.

Purpose of the Study:

  • To develop a microscopic theory for RHT in van der Waals heterostructures.
  • To investigate RHT between graphene and hexagonal boron nitride (hBN) at room temperature.
  • To quantify the efficiency and timescales of carrier cooling dynamics in such systems.

Main Methods:

  • Development of a microscopic theory for RHT.

Related Experiment Videos

  • Theoretical modeling of van der Waals stacks containing graphene and hexagonal boron nitride (hBN).
  • Analysis of heat transfer mediated by evanescent modes and hyperbolic phonon polaritons.

    • Main Results:

    • Demonstrated extremely efficient RHT between hot carriers in graphene and hyperbolic phonon polaritons in hBN.
    • Showcased RHT rates orders of magnitude higher than far-field RHT.
    • Predicted picosecond timescales for carrier cooling dynamics at room temperature.

    Conclusions:

    • Near-field RHT in graphene/hBN heterostructures is exceptionally efficient.
    • Evanescent electromagnetic modes and hyperbolic phonon polaritons play a key role in this enhanced transfer.
    • The findings have implications for ultrafast thermal management and energy conversion at the nanoscale.