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首页> 外文期刊>Nanotechnology >Phonon dissipation in friction with commensurate-incommensurate transition between graphene membranes
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Phonon dissipation in friction with commensurate-incommensurate transition between graphene membranes

机译：Phonon耗散摩擦摩擦 - 在石墨烯膜之间的相称 - 中致

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摘要

To examine phonon transport during the friction process of commensurate-incommensurate transition, the vibrational density of states of contact surfaces is calculated based on molecular dynamics simulations. The results indicate that, compared with the static state, the relative sliding of the contact surfaces causes a blue shift in the interfacial phonon spectrum in or close to commensurate contact, whereas the contrast of the phonon spectrum in incommensurate contact is almost indiscernible. Further findings suggest that the cause of friction can be attributed to the excitation of new in-plane acoustic modes, which provide the most efficient energy dissipation channels in the friction process. In addition, when the tip and the substrate are subjected to a same biaxial compressive/tensile strain, fewer new acoustic modes are excited than in the no strain case. Thus, the friction can be controlled by applying in-plane strain even in commensurate contact. The contribution of the excited acoustic modes to friction at various frequency bands is also calculated, which provides theoretical guidance for controlling friction by adjusting excitation phonon modes.
机译：为了检查在相应的 - 不称蒙转换的摩擦过程中的旋转过程中，基于分子动力学模拟计算接触表面状态的振动密度。结果表明，与静态相比，接触表面的相对滑动导致界面声子谱中或接近相应的接触的蓝色移位，而声子谱的对比几乎是难以清晰的。进一步的研究结果表明，摩擦的原因可以归因于新的面内声学模式的激发，这提供了摩擦过程中最有效的能量耗散通道。另外，当尖端和基板经受相同的双轴压缩/拉伸菌株时，较少的新声学模式令人振奋而不是NO应变壳体。因此，即使在相应的接触中，也可以通过在平面内应变来控制摩擦。还计算了激发声学模式在各种频带处摩擦的贡献，这提供了通过调整激发声子模式来控制摩擦的理论引导。

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