Decomposition of coherent and incoherent phonon conduction in superlattices and random multilayers

Wang, Yan; Huang, Hongyun; Ruan, Xiulin

doi:10.1103/physrevb.90.165406

Cited by 122 publications

(140 citation statements)

References 60 publications

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“…In addition, recent advances in materials science have allowed to engineer the density of states and the group velocity of thermal phonons via interference phenomena in superlattices [24,25] (SLs). Both experimental [26][27][28][29][30] and numerical [31][32][33][34][35][36][37][38][39][40][41][42][43] works stated the importance of coherence on the thermal properties of SLs, as both a wave and a particle description of phonons are necessary to explain most of the results. So far, no clear theoretical framework has allowed to establish quantitatively to what extent phonon modes transit * yann.chalopin@cnrs.fr from a pure plane-wave behavior toward a diffusive pointlike particle.…”

Section: Introductionmentioning

confidence: 99%

Distinguishing between spatial coherence and temporal coherence of phonons

Latour

Chalopin

2017

Phys. Rev. B

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Coherent phonon transport is regarded as a promising strategy for controlling thermal properties in solids using the wave nature of phonons. However, no clear distinction between the spatial and temporal phonon coherence has been accounted for and a formalism that quantifies these two effects is still to be found. In this work, we propose a statistical approach for calculating the spatial and temporal coherence spectra using molecular dynamics simulations. We provide a microscopic assessment of these properties and we theoretically demonstrate that, while temporal and spatial coherence can be analytically related under specific conditions, they represent two characteristic lengths that set apart different physical effects. The former is associated with the phonon mean free path while the latter can be regarded as a measure of localization, representing the spatial extension of phonon wave packets. This provides a framework to engineer heat conduction in solids by quantitatively revealing the wave/particle nature of the vibrational modes.

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Section: Introductionmentioning

confidence: 99%

Distinguishing between spatial coherence and temporal coherence of phonons

Latour

Chalopin

2017

Phys. Rev. B

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“…A microscopic understanding of these interfacial thermal processes requires deconstructing thermal interfacial conductance, which brings many challenges, including consideration of a broad spectrum of interacting dispersive phonons, varying mean free paths, and additional phonon interactions with defects, impurities and other interfacial imperfections [4]. Moreover, as the spacing between two interfaces reduces to distances on the order of the phonon coherence length, wave interference and coherent transport contribute to the thermal resistance in a non-additive fashion [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Role of crystal structure and junction morphology on interface thermal conductance

Polanco

Rastgarkafshgarkolaei

Zhang

et al. 2015

Phys. Rev. B

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We argue that the relative thermal conductance between interfaces with different morphologies is controlled by crystal structure through M min /M c > 1, the ratio between the minimum mode count on either side M min , and the conserving modes M c that preserve phonon momentum transverse to the interface. Junctions with an added homogenous layer, "uniform", and "abrupt" junctions are limited to M c while junctions with interfacial disorder, "mixed", exploit the expansion of mode spectrum to M min . In our studies with cubic crystals, the largest enhancement of conductance from "abrupt" to "mixed" interfaces seems to be correlated with the emergence of voids in the conserving modes, where M c = 0. Such voids typically arise when the interlayer coupling is weakly dispersive, making the bands shift rigidly with momentum. Interfacial mixing also increases alloy scattering, which reduces conductance in opposition with the mode spectrum expansion. Thus the conductance across a "mixed" junction does not always increase relative to that at a "uniform" interface. * cap3fe@virginia.edu

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“…Note that the model described here is in principle applicable to SLs in other material systems, as long as they have high-quality interface and thermal transport is mostly incoherent [48,[73][74][75]. In particular, we focus on thermal transport in III-arsenide-based SLs, as they are most commonly used in mid-IR-QCL active cores [48].…”

Section: Active Core: a Iii-v Superlatticementioning

confidence: 99%

Quantum Cascade Lasers: Electrothermal Simulation

Piprek¹

2017

Handbook of Optoelectronic Device Modeling and Simulation

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Decomposition of coherent and incoherent phonon conduction in superlattices and random multilayers

Cited by 122 publications

References 60 publications

Distinguishing between spatial coherence and temporal coherence of phonons

Distinguishing between spatial coherence and temporal coherence of phonons

Role of crystal structure and junction morphology on interface thermal conductance

Quantum Cascade Lasers: Electrothermal Simulation

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