Volume 116, Number 6, December 2016
|Number of page(s)||5|
|Published online||02 February 2017|
Measurement of second-order response without perturbation
1 2. Physikalisches Institut, Universität Stuttgart - 70550 Stuttgart, Germany
2 SISSA - International School for Advanced Studies and INFN - Trieste, Italy
3 Max Planck Institute for Intelligent Systems - 70569 Stuttgart, Germany
4 4th Institute for Theoretical Physics, Universität Stuttgart - 70550 Stuttgart, Germany
Received: 23 November 2016
Accepted: 16 January 2017
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.
PACS: 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 82.70.Dd – Colloids
© EPLA, 2016
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