Dresden 2017 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Statistical Physics (general)

DY 44.1: Talk

Thursday, March 23, 2017, 10:00–10:15, ZEU 147

Measurement of second-order response without perturbation — •Laurent Helden¹, Urna Basu², Matthias Krüger^3,4, and Clemens Bechinger^1,4 — ¹2. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany — ²SISSA - International School for Advanced Studies and INFN, Trieste, Italy — ³4th Institute for Theoretical Physics, Universität Stuttgart, Germany — ⁴Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany

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 as theoretically outlined in [Basu et al. PCCP 17, 6653 (2015)]. The measured susceptibilities are in quantitative agreement with those obtained from the response to an external perturbation.