Near-field heat transfer between graphene/hBN multilayers
- Stanford Univ., CA (United States). Dept. of Electrical Engineering, Ginzton Lab.; Georgia Inst. of Technology, Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering
- Montpellier Univ. 2 (France). Lab. Charles Coulomb (L2C)
- Georgia Inst. of Technology, Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering
- Stanford Univ., CA (United States). Dept. of Electrical Engineering, Ginzton Lab.
- Montpellier Univ. 2 (France). Lab. Charles Coulomb (L2C); Inst. Univ. de France, Paris (France)
We study the radiative heat transfer between multilayer structures made by a periodic repetition of a graphene sheet and a hexagonal boron nitride (hBN) slab. Surface plasmons in a monolayer graphene can couple with a hyperbolic phonon polaritons in a single hBN lm to form hybrid polaritons that can assist photon tunneling. For periodic multilayer graphene/hBN structures, the stacked metallic/dielectric array can give rise to a further e ective hyperbolic behavior, in addition to the intrinsic natural hyperbolic behavior of hBN. The e ective hyperbolicity can enable more hyperbolic polaritons that enhance the photon tunneling and hence the near- eld heat transfer. However, the hybrid polaritons on the surface, i.e. surface plasmon-phonon polaritons, dominate the near- eld heat transfer between multilayer structures when the topmost layer is graphene. The e ective hyperbolic regions can be well predicted by the e ective medium theory (EMT), thought EMT fails to capture the hybrid surface polaritons and results in a heat transfer rate much lower compared to the exact calculation. The chemical potential of the graphene sheets can be tuned through electrical gating and results in an additional modulation of the heat transfer. We found that the near- eld heat transfer between multilayer structure does not increase monotonously with the number of layer in the stack, which provides a way to control the heat transfer rate by the number of graphene layers in the multilayer structure. The results may bene t the applications of near- eld energy harvesting and radiative cooling based on hybrid polaritons in two-dimensional materials.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001293
- OSTI ID:
- 1470420
- Alternate ID(s):
- OSTI ID: 1372535
- Journal Information:
- Physical Review B, Vol. 95, Issue 24; Related Information: LMI partners with California Institute of Technology (lead); Harvard University; University of Illinois, Urbana-Champaign; Lawrence Berkeley National Laboratory; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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