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DY: Fachverband Dynamik und Statistische Physik

DY 36: Stochastic Thermodynamics

DY 36.4: Vortrag

Mittwoch, 18. März 2020, 10:45–11:00, ZEU 147

Stochastic thermodynamics of a sheared nanoclutch — •Sascha Gerloff and Sabine H. L. Klapp — Hardenbergstr. 36, D-10623 Berlin

Colloidal nanomachines convert optical-, electromagnetic-, acoustic- or chemical energy into usefull mechanical motion. Applications include colloidal microswimmers actuated by an external magnetic field [1] and sheared nanoclutches [2]. In the framework of stochastic thermodynamics, these nanomachines provide a powerful testing bed to explore this conversion of energy, which is related to the microscopic many-body dynamics of the colloids [3]. Following previous experimental studies [2], we focus on a sheared nanoclutch system, which consists of a circular, two-dimensional cluster of colloids that is confined between two rings and driven by optical- and magnetic fields. This system displays a complex non-linear mechanical response, characterized by shear-thinning, local shear-thickening and shear-banding. Performing (overdamped) Stokesian dynamics, we now turn to analyze the stochastic nature of the work and heat produced by this machine. In particular, we investigate how the many-body character of the non-equilibrium dynamics is reflected by the fluctuations of the thermodynamic quantities in the presence of hydrodynamic interactions.
[1] F. Martinez-Pedrero et al., Phys. Rev. Lett. 13, 138301 (2015)
[2] A. Ortiz-Ambriz et al., Soft Matter 14, 5121 (2018)
[3] S. Gerloff and S. H. L. Klapp, Phys. Rev. E 98, 062619 (2018).