非谐链中流体动力模的非常规松弛
Unconventional Relaxation of Hydrodynamic Modes in Anharmonic Chains
摘要：
非线性波动流体动力学（NFHD）是理解输运的一个强有力的框架，但用分子动力学来检验它的有效性仍然具有挑战性。在这里，我们克服了这一挑战，开发了一个有效的计划，用于检测流体动力学模式，考虑到压力波动的作用。结果表明，只有当系统的压力为零且压力涨落较弱时，NFHD对流体动力学模式的弛豫过程的预言才是有效的。对于非零压力，另外两个政权出现的流体动力学模式可以响应于小的和大的压力波动，并在两个额外的不同的方式放松。与以前发现的两个类相反，我们的结果表明，在非谐链中至少有三个普遍性类的运输。
英文摘要：
Nonlinear fluctuating hydrodynamics (NFHD) is a powerful framework for understanding transport, but checking its validity with molecular dynamics is still challenging. Here, we overcome this challenge by developing an effective scheme for detecting hydrodynamic modes that takes into account the role of pressure fluctuations. We show that the predictions given by NFHD on the relaxation processes of hydrodynamic modes are valid only when the pressure of the system is zero and the pressure fluctuations are weak. For nonvanishing pressure, two other regimes arise as the hydrodynamic modes can respond to small and large pressure fluctuations and relax in two additionally distinct manners. In contrast to the previous finding of two classes, our results suggest that there are at least three universality classes of transport in anharmonic chains.
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