Disorder limits the coherent phonon transport in two-dimensional phononic crystal structures

Hu, Shiqian; Zhang, Zhongwei; Jiang, Pengfei; Ren, Weijun; Yu, Cuiqian; Shiomi, Junichiro; Chen, Jie

doi:10.1039/c9nr02548k

“…The vibrational eigen-mode analysis revealed that the phonon localization and phonon back scattering around the nanopores are the major factor responsible for the ultra-low thermal conductivity of GPC. Similar results have also been reported in some other studies (Hu et al, 2019). Analogously, (Cui et al, 2018a) reported that the thermal conductivity of silicene phononic crystal is not sensitive to temperature but strongly depends on the porosity ratio, as that in 3D phononic crystal (Hopkins et al, 2011).…”

Section: From the Perspective Of Phonon-wave Picturesupporting

confidence: 89%

Thermal Transport in Two-Dimensional Heterostructures

Chen

¹

,

Zeng

²

,

Chen

³

2020

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Heterostructures based on two-dimensional (2D) materials have attracted intense attention in recent decades due to their unusual and tunable physics/chemical properties, which can be converted into promising engineering applications ranging from electronics, photonics, and phononics to energy recovery. A fundamental understanding of thermal transport in 2D heterostructures is crucial importance for developing micro-nano devices based on them. In this review, we summarized the recent advances of thermal transport in 2D heterostructures. Firstly, we introduced diverse theoretical approaches and experimental techniques for thermal transport in low-dimensional materials. Then we briefly reviewed the thermal properties of various 2D single-phase materials beyond graphene such as hexagonal boron nitride (h-BN), phosphorene, transition metal dichalcogenides (TMDs) and borophene, and emphatically discussed various influencing factors including structural defects, mechanical strain, and substrate interactions. Moreover, we highlighted thermal conduction control in tailored nanosystems—2D heterostructures and presented the associated underlying physical mechanisms, especially interface-modulated phonon dynamics. Finally, we outline their significant applications in advanced thermal management and thermoelectrics conversion, and discuss a number of open problems on thermal transport in 2D heterostructures.

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“…2b). The phonon participation ratio, P , measures the spatial localization of a phonon mode, and it is defined as 45,46 where N is the total number of atoms and ε iα, is the α th cartesian component of the eigen-mode for the ith atom. P is a dimensionless quantity ranging from 1/N to 1, with ≈ 1 denoting the propagating mode and ≈ 0 denoting the localized mode.…”

Section: Resultsmentioning

confidence: 99%

Lattice thermal transport in two-dimensional alloys and fractal heterostructures

Krishnamoorthy

¹

,

Baradwaj

²

,

Nakano

³

et al. 2021

Sci Rep

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Engineering thermal transport in two dimensional materials, alloys and heterostructures is critical for the design of next-generation flexible optoelectronic and energy harvesting devices. Direct experimental characterization of lattice thermal conductivity in these ultra-thin systems is challenging and the impact of dopant atoms and hetero-phase interfaces, introduced unintentionally during synthesis or as part of deliberate material design, on thermal transport properties is not understood. Here, we use non-equilibrium molecular dynamics simulations to calculate lattice thermal conductivity of $${\mathrm {(Mo|W)Se_2}}$$ ( Mo | W ) Se 2 monolayer crystals including $${\mathrm {Mo}}_{1-x}{\mathrm {W}}_x{\mathrm {Se_2}}$$ Mo 1 - x W x Se 2 alloys with substitutional point defects, periodic $${\mathrm {MoSe_2}|\mathrm {WSe_2}}$$ MoSe 2 | WSe 2 heterostructures with characteristic length scales and scale-free fractal $${\mathrm {MoSe_2}}|{\mathrm {WSe_2}}$$ MoSe 2 | WSe 2 heterostructures. Each of these features has a distinct effect on phonon propagation in the crystal, which can be used to design fractal and periodic alloy structures with highly tunable thermal conductivities. This control over lattice thermal conductivity will enable applications ranging from thermal barriers to thermoelectrics.

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“…Recently, increasing efforts have been made to control the thermal transport [36][37][38]. Analogous to the technique of anti-reflective coating and reflective coating, we can apply the reversion between the half-wave loss and the no-wave loss for the reflected phonon to manipulate the thermal transport across an interface.…”

Section: Discussionmentioning

confidence: 99%

Phonon quarters-wave loss

Xiong

¹

,

Yu

²

,

Wang

³

2019

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There has been a growing interest in the phase of phonon, due to the theoretical prediction (Phys. Rev. Lett. 115.11 (2015)) and the experimental observation (Science 359.6379 (2018)) of chiral phonons, which have different phases in different components. While half-wave loss is a well-known concept in optics, in this work, a series of plateaus of quarters-wave loss are first found for the reflected phonon across an interface by using an atomic junction model. These plateaus can be understood by the Smatrix in the system with time-reversal symmetry. If a phonon wave propagates from a low acousticimpedance material (or a low cutoff frequency material) to a higher one in the long-wave limit (or in the high frequency limit), a half-wave loss takes place for the reflected phonon; however, the plateau of half-wave loss for reflected phonon occurs in the whole frequency domain if phonon transfers to a material with a larger spring constant. Besides the half-wave loss, we also observe plateaus of quarterwave (three-quarters-wave) loss in long wave limit when the two leads with identical acoustic impedance are coupled by a weak (strong) coupling in comparison with the optimum thermal coupling. The quarters-wave loss for phonons can be applied to chiral phonon manipulation and other phononics devices.

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Disorder limits the coherent phonon transport in two-dimensional phononic crystal structures

Abstract: κCNPnC showed a non-monotonic dependence on porosity, and the localization of coherent phonons induced a substantial suppression of κD-C3N.

Cited by 78 publications

References 84 publications

Thermal Transport in Two-Dimensional Heterostructures

Thermal Transport in Two-Dimensional Heterostructures

Lattice thermal transport in two-dimensional alloys and fractal heterostructures

Phonon quarters-wave loss

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