Séminaires PMMH

Séminaire PMMH - Site Jussieu

Séminaires café

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

75005 PARIS

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 récents  (6)

  • 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 - Doron Grossman (Collège de France)
    Vendredi 17 janvier 11:00-12:00 - Salle réunion PMMH 1
    From Molecules to Helical Ribbons - Shape and Shape Fluctuations
    * Self assembly of molecules into supramolecular structures is an important process through which non trivial structures are formed in nano-metric scale. The resulting structure depends on chemical and physical principles that govern the process, and may be sensitive to the exact conditions in which they are (...)
  • Séminaire PMMH Nicolas Triantafyllidis (LMS polytechnique)
    Vendredi 10 janvier 11:00-12:00 - Salle réunion PMMH 1
    Stability is a fascinating topic in solid mechanics that has its roots in the celebrated Euler column buckling problem, which first appeared in 1744. Over the years advances in technology have led to the study of ever more complicated structures first in civil and subsequently in mechanical engineering applications. (...)
  • Séminaire PMMH - Jean-Philippe Bouchaud
    Vendredi 20 décembre 2019 11:00-12:00 - Salle réunion PMMH 1
    Crises et phénomènes socio-économiques collectifs
    Comme l'écrivait P. W. Anderson en 1972 dans « More is different », le comportement de grandes assemblées d'individus ne peut pas être compris à partir de l'extrapolation du comportement d'individus isolés. Au contraire, des comportements complètement nouveaux, parfois spectaculaires et difficiles à anticiper, peuvent (...)
  • Séminaire PMMH - Séverine Atis (Harvard University)
    Vendredi 13 décembre 2019 11:00-12:00 - Salle réunion PMMH 1
    On Growth and Form of Range Expansions at Liquid Interfaces
    Range expansions coupled with fluid flows are of great importance in understanding the organization and competition of microorganism populations in liquid environments. However, combining growth dynamics of an expanding assembly of cells with hydrodynamics leads to challenging problems, involving the coupling of (...)
  • Séminaire PMMH, Vinod Kumar Saranathan (Yale NUS College)
    Vendredi 6 décembre 2019 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 (...)

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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