Funding period: 2021 – 2024

Project leaders: Clemens Bechinger and Matthias Krüger (GAUG)

Scientific staff: Juliane Caspers (GAUG), Dr. Lokesh Chinnakanna, Dr. Debankur Das (GAUG), Dr. Felix Ginot, Dr. Michael Jade Jerez, Dr. Niloyendu Roy, Karthika Kishna Kumar, Samuel Monter, Luis Reinalter

Former members: Dr. Rohit Jain (GAUG)

GAUG = Georg-August-Universität Göttingen

With experiments and theory, we study the behavior of colloidal particles driven through non-Markovian baths. Contrary to Newtonian fluids, which remain in thermal equilibrium under such conditions, this does not apply to e.g. viscoelastic fluids, which are characterized by rather long relaxation times. The strong coupling of colloids to such nonequilibrium baths is expected to lead to novel and unexpected phenomena and nontrivial fluctuations. The main goal of this project is to gain a detailed microscopic understanding of the properties of driven colloidal particles in such environments.

List of publications

Current Preprints

• Nonlinear Langevin functionals for a driven probe
  J. Caspers, M. Krüger
  arXiv:2407.07628 - published 10 July 2024
   
•  Magnetization fluctuations and magnetic aftereffect probed via the anomalous Hall effect
   N. Nabben, G. Sala, U.Nowak, M. Krüger, S. T. B. Goennenwein
   arXiv:2402.18436 - published 28 February 2024

2024

• Universal Symmetry of Optimal Control at the Microscale
  S. A. M. Loos, S. Monter, F. Ginot, and C. Bechinger
  Phys. Rev. X 14, 021032 – published 24 May 2024

2023

• Memory-induced alignment of colloidal dumbbells
  K. K. Kumar, J. Caspers, F. Ginot, M. Krüger, and C. Bechinger
  Sci Rep 13, 17409 - published 13 October 2023
   
• Memory-induced Magnus effect
  X. Cao, D. Das, N. Windbacher, F. Ginot, M. Krüger, and C. Bechinger
  Nat. Phys. (2023) - published 21. September 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 C06

2022

• Recoil experiments determine the eigenmodes of viscoelastic fluids
  F. Ginot, J. Caspers, L. F. Reinalter, K. K. Kumar, M. Krüger, and C Bechinger
  New J. Phys. 24, 123013 - published 15 December 2022
   
• Understanding enhanced rotational dynamics of active probes in rod suspensions
  N. Narinder, M. F. Bos, C. Abaurrea-Velasco, J. de Graaf, and  C. Bechinger
  Soft Matter, 18, 6246 – published 5 August 2022
   
• Barrier Crossing in a Viscoelastic Bath
  Félix Ginot, Juliana Caspers, Matthias Krüger, and Clemens Bechinger
  Phys. Rev. Lett. 128, 028001 – published 11 January 2022

2021

• Micro-rheology of a particle in a nonlinear bath: Stochastic Prandtl–Tomlinson model
  R. Jain, F. Ginot, and M.Krüger
  Phys. Fluids 33, 103101 (2021) – published 1 October 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 C06
   
• Two step micro-rheological behavior in a viscoelastic fluid
  R. Jain, F. Ginot, J. Berner, C. Bechinger, and M. Krüger
  J. Chem. Phys. 154, 184904 (2021) – published 12 May 2021
   
• Bayesian inference of the viscoelastic properties of a Jeffrey’s fluid using optical tweezers
  S. Paul, N. Narinder, A. Banerjee, K. R. Nayak, J. Steindl, and C. Bechinger 
  Sci. Rep. 11, 2023 - published 21 January 2021

Further Publications

• Measurement of second-order response without perturbation
  L. Helden, U. Basu, M. Krüger, and C. Bechinger
  Europhys. Let. 116, 6 - published 2 February 2017
   
• Memory-Induced Transition from a Persistent Random Walk to Circular Motion for Achiral Microswimmers
  N Narinder, C. Bechinger, and J. R. Gomez-Solano
  Phys. Rev. Lett. 121, 078003 – published 17 August 2018
   
• Oscillating modes of driven colloids in overdamped systems
  J. Berner, B. Müller, J. R. Gomez-Solano, M. Krüger & C. Bechinger 
  Nat. Commun. 9, 999 - published 8 March 2018
   
• Active particles sense micromechanical properties of glasses
  C. Lozano, J. R. Gomez-Solano, and C. Bechinger
  Nat. Mater. 18, 1118 - published 5 August 2019
   
• Active particles in geometrically confined viscoelastic fluids
  N. Narinder, J. R. Gomez-Solano, and C. Bechinger
  New J. Phys. 21 093058 - published 24 September 2019