无扰动二阶响应的测量
Measurement of second-order response without perturbation
摘要：
研究了胶体粒子在非谐势作用下的二阶响应函数。与需要外部扰动的典型响应测量相反，在这里，我们通过实验证实了最近开发的方法，其中从粒子的平衡轨迹获得系统的二阶可伸缩性[PCCP $\mathrm{\bf 17}$，6653（2015）]。所测得的磁化率与从外部扰动的响应中获得的那些在定量上一致。
英文摘要：
We study the second order response functions of a colloidal particle being subjected to an anharmonic potential. Contrary to typical response measurements which require an external perturbation, here we experimentally confirm a recently developed approach where the system's susceptibilities up to second order are obtained from the particle's equilibrium trajectory [PCCP $\mathrm{\bf 17}$, 6653 (2015)]. The measured susceptibilities are in quantitative agreement with those obtained from the response to an external perturbation.
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