Influence of hBN orientation on the near-field radiative heat transfer between graphene/hBN heterostructures

Wu, Xiaohu; Fu, Ceji; Zhang, Zhuomin

doi:10.1117/1.jpe.9.032702

Cited by 66 publications

(35 citation statements)

References 45 publications

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“…Although it is not shown here, we have plotted with different chemical potentials at both 300 K and 400 K, and the consistent values within infrared region indicate the insensitivity to temperature of , which could also be verified by the equation applied in Ref. [39][40][41] to calculate in infrared region. For sake of improving the computational efficiency, we assume that is independent of for all the calculations.…”

Section: Physical Model and Theoretical Calculation 21 Physical Modelsupporting

confidence: 76%

Near-Field Radiative Thermal Modulation by Tunneling Through Graphene Sheet

Hu¹,

Xianglin²,

Yang³

et al. 2020

ES Energy Environ.

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In this paper, we have theoretically demonstrated a graphene-mediated near-field radiative thermal modulator based on doped silicon-graphene-doped silicon three-slab configuration. The near-field photon tunneling between the doped silicon emitter and receiver is modulated by changing chemical potential of graphene sheet and the separation distance between the sheet and the emitter. The near-field three-body theory built on fluctuational electrodynamics is used to calculate total radiative heat flux, which could be modulated in a range of 10-70 kW/m 2 with different setup for graphene chemical potential and its position. The underlying mechanism is illustrated as varied coupling behavior of surface plasmon polaritons between doped silicon and graphene sheet. Several dimensionless factors such as normalized heat flux, sensitivity factor and switching factor are also introduced for comprehensive analysis of the performance of modulation effect. The results obtained here will trigger a new way for near-field active thermal management between bulk materials utilizing suspended 2-D materials.

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Section: Physical Model and Theoretical Calculation 21 Physical Modelsupporting

confidence: 76%

Near-Field Radiative Thermal Modulation by Tunneling Through Graphene Sheet

Hu¹,

Xianglin²,

Yang³

et al. 2020

ES Energy Environ.

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“…As θ increases, the heat transfer enhances and reaches the maximum at θ = 90°. The enhancing trend of NFRHT with twisted angle, has never been observed in the previous studies considering twisting between two anisotropic materials [4,[56][57][58][59]. In Fig.…”

Section: Resultsmentioning

confidence: 49%

Radiative thermal switch driven by anisotropic black phosphorus plasmons

He¹,

Qi²,

Ren³

et al. 2020

Opt. Express

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Black phosphorus (BP), as a two-dimensional material, has exhibited unique optoelectronic properties due to its anisotropic plasmons. In the present work, we theoretically propose a radiative thermal switch (RTS) composed of BP gratings in the context of near-field radiative heat transfer. The simply mechanical rotation between the gratings enables considerable modulation of radiative heat flux, especially when combined with the use of non-identical parameters, i.e., filling factors and electron densities of BP. Among all the cases including asymmetric BP gratings, symmetric BP gratings, and BP films, we find that the asymmetric BP gratings possess the most excellent switching performance. The optimized switching factors can be as high as 90% with the vacuum separation d=50 nm and higher than 70% even in the far-field regime d=1 µm. The high-performance switching is basically attributed to the rotatable-tunable anisotropic BP plasmons between the asymmetric gratings. Moreover, due to the twisting principle, the RTS can work at a wide range of temperature, which has great advantage over the phase change materials-based RTS. The proposed switching scheme has great significance for the applications in optoelectronic devices and thermal circuits.

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“…[45] The energy transmission coefficient can be obtained by solving the reflection and transmission coefficients using the 4×4 transfer matrix method. [42] In the calculations, the temperatures of the emitter and the receiver are set as 300 K and 0 K, respectively. In addition, the vacuum gap is maintained at d = 20 nm.…”

Section: Theory and Methodsmentioning

confidence: 99%

“…The hyperbolic property is no longer maintained when the tangential wave vector component is greater than   (  is the unit period of metamaterial). [40] For natural uniaxial hyperbolic materials, such as hexagonal boron nitride (hBN), this limitation can be ignored because the lattice constant is on the order of subnanometer, [41,42] thereby the natural hyperbolic materials have unique advantages. As a natural biaxial hyperbolic crystal, α-MoO3 has wider hyperbolic bands.…”

Section: Introductionmentioning

confidence: 99%

Near-field Radiative Heat Transfer between Graphene Covered Biaxial Hyperbolic Materials

Wu¹,

Liu²

2020

ES Energy Environ.

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The plasmons in graphene and phonon polaritons in hyperbolic materials provide new approach to mediate near-field radiative heat transfer (NFRHT). This work study the NFRHT between graphene covered biaxial hyperbolic crystal α-MoO3. The numerical results show that the coupling between plasmons in graphene and phonon polaritons in α-MoO3 can greatly enhance the total heat flux. The spectral heat flux in the Reststrahlen bands can be suppressed or enhanced, depending on the value of the chemical potential of the graphene. What is perhaps most important here is that it is found that the surface plasmon-phonon polaritons can either enhance or suppress the heat transfer, which has not been reported in previous studies. The findings in this work can deepen our understanding of the coupling between graphene plasmons and phonon polaritons in hyperbolic materials.

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Influence of hBN orientation on the near-field radiative heat transfer between graphene/hBN heterostructures

Cited by 66 publications

References 45 publications

Near-Field Radiative Thermal Modulation by Tunneling Through Graphene Sheet

Near-Field Radiative Thermal Modulation by Tunneling Through Graphene Sheet

Radiative thermal switch driven by anisotropic black phosphorus plasmons

Near-field Radiative Heat Transfer between Graphene Covered Biaxial Hyperbolic Materials

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