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DY: Fachverband Dynamik und Statistische Physik

DY 43: Stochastic thermodynamics and information processing

DY 43.12: Vortrag

Mittwoch, 14. März 2018, 13:00–13:15, BH-N 243

Stochastic aspects of thermodynamic irreversibility in nanoscale friction — •Paola Carolina Torche, Andrea Silva, Denis Kramer, Tomas Polcar, and Ondrej Hovorka — University of Southampton, Southampton, UK

Understanding the energy dissipation occurring during the nanoscale friction processes remains an open challenge. This is partly due to the lack of availability of a consistent and sufficiently general thermodynamic framework that would allow separating the microscopic, fluctuating, work performed by a nanoscale slider into the relevant internal energies and the irreversible heat produced during the motion.

In this talk we discuss the possibility of applying the principles of the modern stochastic thermodynamics [1] to quantify the fluctuating work and irreversible heat at the coarse-grained level of description of nanoscale friction, namely to the stochastic trajectories generated by the tip of Friction Force microscope [2]. By considering the Prandtl-Tomlinson model of a stick-slip frictional motion augmented by thermal fluctuations modelled by the transition state theory, we show that it is possible to fully quantify the stochastic entropy, work and heat distributions associated with the sliding motion. We then discuss the possibilities of validating the developed computational approach with Atomic Force Microscopy experiments.

[1] U. Seifert, Stochastic thermodynamics, fluctuation theorems, and molecular machines, Rep. Prog. Phys. 75, 126001 (2012).

[2] Gnecco et al, Velocity dependence of atomic friction, Phys. Rev. Lett. 84, 1172 (2000).