Séminaires PMMH

Séminaire PMMH - Site Jussieu

Séminaires café

Contact :
Benoit Semin
Sylvain Patinet
Etienne Reyssat
responsables-seminaires (arobase) pmmh.espci.fr

PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France

Tel : (33) 1 40 79 45 22

Comment venir ?

7 quai Saint Bernard, 75005 PARIS

Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu.


Séminaire PMMH- Pedro Saenz (University of North Carolina at Chapel Hill)

Vendredi 25 octobre 2019 11:00-12:00 - Salle réunion PMMH 1

Hydrodynamic Spin Lattices

Mesoscale and macroscale analogs of electronic spin systems, such as ultra-cold fermionic lattice gases and mechanical metamaterials, offer direct insights into fundamental physical prin ciples while simultaneously promising groundbreaking applications, from quantum computation and simulators to photonic and phononic band gap materials. In this talk, we introduce hydrodynamic spin lattices (HSLs) of walking droplets as a new class of highly tunable active spin analog systems. Millimetric liquid droplets can walk across the surface of a vibrating fluid bath, self-propelled through a resonant interaction with their own guiding wave fields. A walking droplet, or ‘walker', may be trapped by a submerged circular well at the bottom of the fluid bath, leading to a clockwise or counterclockwise angular motion centered at the well. When a collection of such wells is arranged in a 1D or 2D lattice geometry, a thin fluid layer between wells enables wave-mediated interactions between neighboring walkers. Through experiments and mathematical modeling, we demonstrate the spontaneous emergence of coherent droplet rotation dynamics for different types of lattices. For sufficiently strong pair-coupling, wave interactions between neighboring droplets may induce local spin flips leading to ferromagnetic or antiferromagnetic order. Transitions between these two forms of magnetic order can be induced through variations in non-equilibrium driving, lattice geometry and Coriolis forces mimicking an external magnetic field. Our experimental results agree with theoretical predictions from a generalized Kuramoto model derived from first principles, establishing HSLs as a generic paradigm for active phase oscillator dynamics with complex particle-wave coupling.

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Séminaires  (4)

  • Séminaire PMMH- Kristina Davitt (ENS)
    Vendredi 24 janvier 11:00-12:00 - Salle réunion PMMH 1
    Wetting hysteresis and dynamics : interpreting dissipation mechanisms at the contact line
    A liquid moving over a solid substrate is an everyday occurrence, and the hysteresis and dynamics of the three-phase contact line have been measured in innumerable experiments over the years. In addition, the ingredients needed to describe the phenomenon are known : in the most basic picture, there is viscous (...)
  • Séminaire PMMH- Dwight Barkley (University of Warwick)
    Vendredi 31 janvier 11:00-12:00 - Salle réunion PMMH 1
    A fluid mechanic's analysis of the tea-cup singularity
    In 1926 Einstein published a short paper explaining the meandering of rivers. He famously began the paper by discussing the secondary flow generated in a stirred tea cup — the flow now widely known to be responsible for the collection of tea leaves at the center of a stirred cup of tea. In 2014, Luo and Hou (...)
  • Séminaire PMMH- Elisabeth Guazzelli (MSC)
    Vendredi 7 février 11:00-12:00 - Salle réunion PMMH 1
    Particle motion in vortical flows
    In many natural phenomena or industrial applications, heavy particles are transported in complex flows. The flow structures may happen to promote the stirring and dispersion of the particles. But the opposite can also take place and the flow configuration may contribute to the focussing and accumulation of (...)
  • Séminaire PMMH - Sergei Nechaev (Center Poncelet, CNRS UMI 2615)
    Vendredi 3 avril 11:00-12:00 - Salle réunion PMMH 1
    Anomalous statistics of extreme random processes
    I am going to discuss two problems of extreme statistics in which unusual (but related to each other) features arise : i) statistics of two-dimensional "stretched" random walks over a semicircle with Kardar-Parisi-Zhang (KPZ) scaling, ii) spectral properties of symmetric three-diagonal random matrices (operators) (...)

Instructions générales pour les conférenciers

Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.

Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.

Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.

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Informations Pratiques

Laboratoire : 01 40 79 45 22
Directeur : Damien Vandembroucq
Codirecteur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr

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