Thermal conductance of graphene/hexagonal boron nitride heterostructures

Lu, Simon; McGaughey, Alan J. H.

doi:10.1063/1.4978362

Cited by 24 publications

(12 citation statements)

References 50 publications

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“…In contrast, the conductance and transmissions of BN nanosheets with vacancy defects continuously increase by increasing the bias voltage. For the perfect BN nanosheet as well as the nanosheets with the vacancy defect at its center and left and right side, the integrated transmission initially increases and by more increase of the voltage, it decreases [31][32].…”

Section: Resultsmentioning

confidence: 99%

Effect of the vacancy on the electrical transport properties of boron nitride nanosheets

Sadeghi

Yaghobi

Niazian

et al. 2021

Preprint

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Vacancies occur naturally in all crystalline materials. A vacancy is a point defect in a crystal in which an atom is removed at one of the lattice sites. The defect could be imported during the synthesis of the material or be added by defect engineering. In this paper by employing the density functional theory as well as the non-equilibrium Green’s function approach, the structure and electronic properties of the perfect and defected BN nanosheet would be obtained and compared. Besides, the influence of the vacancy defect position is evaluated. For this purpose, the defect is considered at the center, left, and right hand sides of the nanosheet. It is seen that the electric current changes by changing the position of the vacancy defect, which is related to the electronic structures of BN nanosheets. In addition, the transmission and conductance for BN nanosheets with vacancy continuously change by changing the bias voltage. The obtained results can benefit the design and implementation of BN nanosheets in nanoelectronic systems and devices.

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Section: Resultsmentioning

confidence: 99%

Effect of the vacancy on the electrical transport properties of boron nitride nanosheets

Sadeghi

Yaghobi

Niazian

et al. 2021

Preprint

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“…where t is the thickness of a graphene layer, which we take to be 0.5 nm based on previous studies on graphene plasmonic nanostructures [45,46]. We note that studies of thermal transport in graphene often use a thickness of 0.34 nm, which is based on the layer separation in graphite [47,48]. For a disk diameter of 100 nm, G edge BB = 1.9 × 10 −6 pW/K, which is 25 times smaller than G BB .…”

Section: Near-field Radiation In Coplanar Disk Dimersmentioning

confidence: 99%

Near-field radiative heat transfer in graphene plasmonic nanodisk dimers

2017

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Near-field thermal radiation mediated by surface plasmons in parallel graphene nanodisk dimers is studied using a semianalytical model under the electrostatic approximation. The radiative heat transfer between two disks as a function of the distance between them in coaxial and coplanar configurations is first considered. Three regimes are identified and their extents determined using nondimensional analysis. When the edge-to-edge separation is smaller than the disk diameter, near-field coupling and surface plasmon hybridization lead to an enhancement of the radiative heat transfer by up to four orders of magnitude compared to the Planck blackbody limit. A mismatch in the disk diameters affects the plasmonic mode hybridization and can either diminish or enhance the near-field radiation. Destructive interference between eigenmodes that emerge when the relative orientation between disks is varied can induce a twofold reduction in the radiative heat transfer. In all configurations, the radiative heat transfer properties can be controlled by tuning the disk size/orientation, the substrate optical properties, and graphene's doping concentration and electron mobility.

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“…A graphene thickness of 0.5 nm is chosen based on previous studies of graphene plasmonic nanostructures [8,12]. We note that studies of thermal transport in graphene often use a thickness of 0.34 nm, which is based on the layer separation in graphite [33,34].…”

Section: A Heat Capacity and Thermal Conductivity Of Disk Arraysmentioning

confidence: 99%

Plasmonic thermal transport in graphene nanodisk waveguides

Ramirez

McGaughey

2017

Phys. Rev. B

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The thermal radiation properties of guided surface plasmons in one-dimensional co-planar graphene nanodisk arrays are predicted using a semi-analytical electrostatic model. The plasmonic band structure contains nonlocalized dispersion bands that are well-described by the electrostatic model for disk diameters smaller than 200 nm. A nondimensional model is proposed that enables systematic analysis of the waveguiding properties based on scaling laws. The thermal transport is dominated by the lowest-order radial modes and can be controlled by tuning the disk size, the substrate optical properties, and graphene's doping concentration and electron mobility. The maximum predicted thermal conductivity and thermal diffusivity are 4.5 W m −1 K −1 and 1.3 × 10 −3 m 2 /s, orders of magnitude larger than predictions of thermal transport by guided surface plasmon-or phonon-polaritons in other materials. The results suggest that graphene surface plasmons, which can be thermally-activated at room temperature, are a suitable platform for tunable and fast thermal transport, with potential application as photon-based thermotronic interconnects.

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Thermal conductance of graphene/hexagonal boron nitride heterostructures

Cited by 24 publications

References 50 publications

Effect of the vacancy on the electrical transport properties of boron nitride nanosheets

Effect of the vacancy on the electrical transport properties of boron nitride nanosheets

Near-field radiative heat transfer in graphene plasmonic nanodisk dimers

Plasmonic thermal transport in graphene nanodisk waveguides

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