Séminaires PMMH

Séminaire PMMH - Site Jussieu

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 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  (5)

  • Séminaire PMMH - Jérôme Fresnais (PHENIX, UPMC)
    Vendredi 15 novembre 11:00-12:00 - Salle réunion PMMH 1
    Making superhydrophobic surfaces with magnetic elastomer : towards controlled droplet movement
    In the field of superhydrophobic surfaces, natural surfaces exhibiting non-wetting filament networks remain a challenge to understand. Indeed, if classical superhydrophobic surfaces developed roughness at different scales, superhydrophobicity on hairy surfaces shows elastic behavior that is more difficult to (...)
  • Séminaire PMMH — Miguel Fernandez (équipe-projet Commedia, INRIA Paris)
    Vendredi 22 novembre 11:00-12:00 - Salle réunion PMMH 1
    Numerical methods for fluid-structure interaction with immersed elastic bodies
  • Séminaire PMMH, Vinod Kumar Saranathan (Yale NUS College)
    Vendredi 6 décembre 11:00-12:00 - Salle réunion PMMH 1
    Biomimetic and Bio-inspired Potential of Self-assembled Biophotonic Nanostructures
    Colors in Nature can be produced either chemically, by the selective light bsorption by pigments, or physically, by light interference from biophotonic nanostructures. Intriguingly, there are almost no known violet, blue or green pigments in animals. And yet these structurally produced colors are ubiquitous in (...)
  • Séminaire PMMH - Jean-Philippe Bouchaud
    Vendredi 20 décembre 11:00-12:00 - Salle réunion PMMH 1
    Physique et modélisation de l'économie
  • Séminaire PMMH- Elisabeth Guazzelli (MSC)
    Vendredi 7 février 2020 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 (...)

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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