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  • Yann-Edwin Keta

    Sorbonne Université — PMMH

    Associate professor (maître de conférences) of physics

    September 2025 - Present

    UFR de Physique, Faculté des Sciences et Ingénierie, Sorbonne Université
    Laboratoire de Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR 7636 CNRS, ESPCI Paris — PSL, Sorbonne Université, Université Paris-Cité

    Paris, France


    Postdoc: Physical models of cell sheets

    Supervised by: Silke Henkes  •  October 2023 - August 2025

    Instituut-Lorentz for Theoretical Physics, Universiteit Leiden

    Leiden, Netherlands
    Associated publications
    External ressources


    PhD: Emergence of disordered collective motion in dense systems of isotropic self-propelled particles

    Supervised by: Ludovic Berthier (Montpellier), Robert L. Jack (Cambridge)  •  September 2020 - September 2023

    Laboratoire Charles Coulomb, UMR 5221 CNRS, Université de Montpellier

    Montpellier, France
    Associated publications
    External ressources


    Large deviations of active particles

    Supervised by: Robert L. Jack, Michael E. Cates (Cambridge), and Frédéric van Wijland (Paris)  •  October 2019 - July 2020

    Department of Applied Mathematics and Theoretical Physics, University of Cambridge

    Cambridge, United Kingdom

    Laboratoire Matière et Systèmes Complexes, UMR 7057 CNRS, Université de Paris

    Paris, France
    Associated publication
    External ressources


    Glassy behaviour in phase-separating active matter

    Supervised by: Jörg Rottler  •  January 2018 - July 2018

    Stewart Blusson Quantum Matter Institute, University of British Columbia

    Vancouver, Canada
    Description

    We have worked on a numerical model system of polydisperse active Brownian disks with purely repulsive interparticle harmonic potential, inspired by Fily et al. [Soft Matter 10, 2132-2140 (2014)]. Despite its simplicity, this model displays interesting collective behaviours: motility-induced phase separation (MIPS) [Cates and Tailleur, Annu. Rev. Condens. Matter Phys. 6, 219-244 (2015)] and long-ranged displacement correlations, even on time scales greater than the rotational diffusion time. We showed that the transition from the fluid to the phase separated regime, which characterises MIPS, is accompanied by increased dynamical heterogeneity. Moreover, we provided evidence of an \(r^{-2}\) decay of shear strain correlations on time scales short compared to the rotational diffusion time, both in the dense region of our phase separated system at high activity and in the truly glassy phase [Keta and Rottler, EPL 125, 58004 (2019)]. We attributed the origin of the \(r^{-2}\) decay to elastic interactions that lead to similar behaviour in passive glass formers.

    Associated publication
    External ressources


    Jamming criticality of spheroids

    Supervised by: Peter Olsson  •  May 2017 - July 2017

    Institutionen för fysik, Umeå universitet

    Umeå, Sweden
    Description

    We adapted models and methods which were initially used to study shear jamming of frictionless soft 2D disks in order to consider 3D ellipsoids, and in particular spheroids — ellispoids of revolution.

    Associated publications
    External ressources


    Leidenfrost drop impacts on surfaces with micrometric defects

    Supervised by: Quentin Ehlinger and Christophe Ybert  •  June 2016 - July 2016

    Institut Lumière Matière, UMR 5306 CNRS, Université Claude Bernard Lyon 1

    Lyon, France
    Description

    We aimed at using data obtained from drop impacts on single micrometric defects to predict the phenomenology of impacts on more complex networks.