Coherent and incoherent thermal transport in nanomeshes

Ravichandran, Navaneetha K.; Minnich, Austin J.

doi:10.1103/physrevb.89.205432

Cited by 93 publications

(115 citation statements)

References 40 publications

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“…In practice, these pore-edge defects will slightly expand the effective pore diameter in phonon MC simulations. 32 Assuming diffusive phonon scattering by pore edges, k L can be predicted using the kinetic relationship by modifying a)…”

Section: Introductionmentioning

confidence: 99%

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Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials

Hao

Xiao

Zhao

2016

Journal of Applied Physics

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In the past two decades, phonon transport within nanoporous thin films has attracted enormous attention for their potential applications in thermoelectrics and thermal insulation. Various computational studies have been carried out to explain the thermal conductivity reduction within these thin films. Considering classical phonon size effects, the lattice thermal conductivity can be predicted assuming diffusive pore-edge scattering of phonons and bulk phonon mean free paths. Following this, detailed phonon transport can be simulated for a given porous structure to find the lattice thermal conductivity [Hao et al., J. Appl. Phys. 106, 114321 (2009)]. However, such simulations are intrinsically complicated and cannot be used for the data analysis of general samples. In this work, the characteristic length K Pore of periodic nanoporous thin films is extracted by comparing the predictions of phonon Monte Carlo simulations and the kinetic relationship using bulk phonon mean free paths modified by K Pore . Under strong ballistic phonon transport, K Pore is also extracted by the Monte Carlo ray-tracing method for graphene with periodic nanopores. The presented model can be widely used to analyze the measured thermal conductivities of such nanoporous structures. Published by AIP Publishing. [http://dx

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Section: Introductionmentioning

confidence: 99%

“…10,11,31,32,35 Other k L predictions are based on the numerical 6,7,36,37 and analytical 38,39 solutions of the phonon Boltzmann transport equation (BTE). However, these studies are still complicated and cannot be used for the thermal analysis of general samples with varied porous structures.…”

Section: Introductionmentioning

confidence: 99%

Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials

Hao

Xiao

Zhao

2016

Journal of Applied Physics

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“…32 suggested that it was possible to obtain thermal conductivity close to the amorphous limit with truly nanoscale features. More recent theory, 9,10 following the publication of data on nanostructures, has revisited the Boltzmann transport simulations while considering frequency dependent scattering rates. These are discussed further in Sec.…”

Section: Sub-continuum Phonon Transportmentioning

confidence: 99%

“…The most detailed consideration of transport in periodic structures till date involves modeling phonons through either atomistic simulations [23][24][25] or tracking their trajectories through Monte Carlo simulations. 9,10 We review basic phonon scattering physics here and discuss specific calculations later in Sec. VI.…”

Section: Sub-continuum Phonon Transportmentioning

confidence: 99%

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Thermal transport in 2- and 3-dimensional periodic “holey” nanostructures

Sadhu

Ganta

et al. 2014

AIP Advances

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Understanding thermal transport in two- and three-dimensional periodic “holey” nanostructures is important for realizing applications of these structures in thermoelectrics, photonics and batteries. In terms of continuum heat diffusion physics, the effective medium theory provides the framework for obtaining the effective thermal conductivity of such structures. However, recently measured nanostructures possess thermal conductivities well below these continuum predictions. In some cases, their thermal conductivities are even lower than predictions that account for sub-continuum phonon transport. We analyze current understanding of thermal transport in such structures, discussing the various theories, the measurements and the insights gained from comparing the two.

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2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Sledzinska

Graczykowski

Maire

et al. 2019

Adv Funct Materials

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The central concept in phononics is the tuning of the phonon dispersion relation, or phonon engineering, which provides a means of controlling related properties such as group velocity or phonon interactions and, therefore, phonon propagation, in a wide range of frequencies depending on the geometries and sizes of the materials. Phononics exploits the present state of the art in nanofabrication to tailor dispersion relations in the range of GHz for the control of elastic waves/phonons propagation with applications toward new information technology concepts with phonons as state variable. Moreover, phonons provide an adaptable approach for supporting a coherent coupling between different state variables, and the development of nanoscale optomechanical systems during the last decade attests this prospect. The most extended approach to manipulate the phonon dispersion relation is introducing an artificial periodic modulation of the elastic properties, which is referred to as phononic crystal (PnC). Herein, the focus is on the recent experimental achievements in the fabrication and application of 2D PnCs enabling the modification of the dispersion relation of surface and membrane modes, and presenting phononic bandgaps, waveguiding, and confinement in the hypersonic regime. Furthermore, these artificial materials offer the potential of modifying and controlling the heat flow to enable new schemes in thermal management.

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Coherent and incoherent thermal transport in nanomeshes

Cited by 93 publications

References 40 publications

Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials

Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials

Thermal transport in 2- and 3-dimensional periodic “holey” nanostructures

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

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