@article{Helden2017Measu-39232,
  year={2017},
  doi={10.1209/0295-5075/116/60003},
  title={Measurement of second-order response without perturbation},
  number={6},
  volume={116},
  issn={0295-5075},
  journal={EPL (Europhysics Letters)},
  author={Helden, Laurent and Basu, Urna and Krüger, Matthias and Bechinger, Clemens},
  note={Article Number: 60003}
}

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    <dc:contributor>Krüger, Matthias</dc:contributor>
    <dc:creator>Basu, Urna</dc:creator>
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    <dcterms:abstract xml:lang="eng">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 demonstrate that the system's susceptibilities up to second order can be obtained from the particle's equilibrium fluctuations. The measured susceptibilities are in quantitative agreement with those obtained from the response to an external perturbation.</dcterms:abstract>
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