| How Does van der Waals Confinement Enhance Phonon Transport? |
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| 作者姓名： | 余晓翔 马登科 邓程程 万骁 安盟 孟涵 李小波 黄晓明 杨诺 |
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| 作者单位： | State Key Laboratory of Coal Combustion;School of Energy and Power Engineering;NNU-SULI Thermal Energy Research Center（NSTER）&Center for Quantum Transport and Thermal Energy Science（CQTES）;College of Mechanical and Electrical Engineering |
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| 基金项目： | Supported by the National Natural Science Foundation of China(Grant Nos.51606072 and 51576077). |
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| 摘 要： | We study the mechanism of van der Waals(vdW)interactions on phonon transport in atomic scale,which would boost developments in heat management and energy conversion.Commonly,the vdW interactions are regarded as a hindrance in phonon transport.Here we propose that the vdW confinement can enhance phonon transport.Through molecular dynamics simulations,it is realized that the vdW confinement is able to make more than two-fold enhancement on thermal conductivity of both polyethylene single chain and graphene nanoribbon.The quantitative analyses of morphology,local vdW potential energy and dynamical properties are carried out to reveal the underlying physical mechanism.It is found that the confined vdW potential barriers reduce the atomic thermal displacement magnitudes,leading to less phonon scattering and facilitating thermal transport.Our study offers a new strategy to modulate the phonon transport.
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| 关 键 词： | mechanism. PHONON DYNAMICAL |
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