Project C06 - Fuchs

Funding period: 2021 – 2024 

Project leader: Matthias Fuchs

Scientific staff: Nikolas Ditz, Saswati Ganguly, Stefan Gerlach

The activated crossing of an energy barrier is a ubiquitous dynamical process in materials, yet activation far from thermal equilibrium and in high dimensional energy landscapes remains poorly understood. The project will develop a theoretical framework for studying the spectroscopy of intramolecular fluctuations of a bistable probe particle in a flowing fluid or deforming amorphous solid. The conditions for observing activated dynamics in the nonlinear (double-well) potential coupled to the driven particulate bath will be investigated from first principles and the concepts of mechanical noise and effective temperature scrutinized.

List of publications

2023

• Crystal to crystal transformation in soft ionic microgels: Kinetics and the role of local mechanical susceptibilities
  S. Ganguly, S. Nöjd, A. Yethiraj, P. Schurtenberger, and P. S. Mohanty
  Phys. Rev. Materials 7, L080401 – published 28 August 2023
   
• How are mobility and friction related in viscoelastic fluids?
  J. Caspers, N. Ditz, K. K. Kumar, F. Ginot, C. Bechinger, M. Fuchs, and M. Krüger
  J. Chem. Phys. 158, 024901 (2023) - published 9 January 2023
  related also to project C05

2021

• Brownian systems perturbed by mild shear: Comparing response relations
  K. Asheichyk, M. Fuchs, and M. Krüger
  J. Phys. Condens. Matter 33, 405101 (2021) - published  30 July 2021
  related also to project C05

Further Publications

• Observation of Strongly Heterogeneous Dynamics at the Depinning Transition in a Colloidal Glass
  N. Şenbil, M. Gruber, C. Zhang, ‚M. Fuchs, and F. Scheffold
  Phys. Rev. Lett. 122, 108002 – published 13 March 2019
   
• Dynamics of a noninteracting colloidal fluid in a quenched Gaussian random potential: a time-reversal-symmetry-preserving field-theoretic approach
  B. Kim, M. Fuchs, and V. Krakoviac
  J. Stat. Mech. 023301 - published 12 February 2020
   
• Shear-induced breaking of cages in colloidal glasses: Scattering experiments and mode coupling theory 
  C. P. Amann,  D. Denisov,  M. T. Dang,  B. Struth,  P. Schall, M. Fuchs
  J. Chem. Phys. 143, 034505 - published 21 July 2015
   
• Fluctuation Dissipation Relations in Stationary States of Interacting Brownian Particles under Shear
  M. Krüger, and M. Fuchs
  Phys. Rev. Lett. 102, 135701 – published 31 March 2009
   
• Rheology of Inelastic Hard Spheres at Finite Density and Shear Rate
  W. Till Kranz, Fabian Frahsa, Annette Zippelius, Matthias Fuchs, and Matthias Sperl
  Phys. Rev. Lett. 121, 148002 – published 2 October 2018
   
• Integration through transients for inelastic hard sphere fluids
  W. Till Kranz, Fabian Frahsa, Annette Zippelius, Matthias Fuchs, and Matthias Sperl
  Phys. Rev. Fluids 5, 024305 – published 28 February 2020