Super-Planckian Electron Cooling in a van der Waals Stack
Radiative heat transfer (RHT) between macroscopic bodies at separations that are much smaller than the thermal wavelength is ruled by evanescent electromagnetic modes and can be orders of magnitude more efficient than its far-field counterpart, which is described by the Stefan-Boltzmann law. In this...
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| Veröffentlicht in: | Physical review letters 2017-03, Vol.118 (12), p.126804-126804, Article 126804 |
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| container_title | Physical review letters |
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| creator | Principi, Alessandro Lundeberg, Mark B Hesp, Niels C H Tielrooij, Klaas-Jan Koppens, Frank H L Polini, Marco |
| description | Radiative heat transfer (RHT) between macroscopic bodies at separations that are much smaller than the thermal wavelength is ruled by evanescent electromagnetic modes and can be orders of magnitude more efficient than its far-field counterpart, which is described by the Stefan-Boltzmann law. In this Letter, we present a microscopic theory of RHT in van der Waals stacks comprising graphene and a natural hyperbolic material, i.e., hexagonal boron nitride (hBN). We demonstrate that RHT between hot carriers in graphene and hyperbolic phonon polaritons in hBN is extremely efficient at room temperature, leading to picosecond time scales for the carrier cooling dynamics. |
| doi_str_mv | 10.1103/PhysRevLett.118.126804 |
| format | Article |
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| ispartof | Physical review letters, 2017-03, Vol.118 (12), p.126804-126804, Article 126804 |
| issn | 0031-9007 1079-7114 |
| language | eng |
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| source | American Physical Society Journals |
| subjects | Carriers Cooling Graphene Polaritons Radiative heat transfer Stacks Time Wavelengths |
| title | Super-Planckian Electron Cooling in a van der Waals Stack |
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