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Eigenstates of soft-mode vibrational excitations in thin-film metallic glasses

机译:薄膜金属眼镜中软模式振动激发的特征

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摘要

The vibrational excitations in Cu50Zr50 thin-film metallic glasses are investigated using molecular dynamics simulations. A strong density layering parallel to surfaces is formed in the glassy thin films. This layering behavior results in a layerlike arrangement of soft regions through films. The vibrational excitations in the periodic soft layers are proved to be harmonic and in analog y with the simple one-dimensional lattice vibration. A low-frequency and optical-like phonon mode features the soft-mode excitations. The soft-mode excitations enhance the vibrational density of states in the low-frequency side, depending on the softness of layers. Our results provide direct evidence supporting the low-frequency and nonacoustic vibrational excitations of soft domains in glasses.
机译:使用分子动力学模拟研究CU50ZR50薄膜金属玻璃中的振动激发。在玻璃薄膜中形成平行于表面的强密度分层。该层状行为导致通过薄膜的软区域的层状布置。经过简单的一维格子振动,证明了周期性软层中的振动激发是谐波和模拟y。低频和光学声子模式具有软模式激励。根据层的柔软性,软模式激发增强了低频侧的状态的振动密度。我们的结果提供了支持眼镜软域的低频和非声音振动激发的直接证据。

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  • 来源
    《Physical review》 |2019年第14期|144202.1-144202.8|共8页
  • 作者

    Lu Y. J.; Bi Q. L.; Wang W. H.;

  • 作者单位

    Sch Phys Beijing Inst Technol Beijing 100081 Peoples R China;

    Sch Phys Beijing Inst Technol Beijing 100081 Peoples R China|Southwest Inst Tech Phys Chengdu 610041 Sichuan Peoples R China;

    Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China;

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