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DTSTART;TZID=Europe/Paris:20210610T133000
DTEND;TZID=Europe/Paris:20210610T143000
DTSTAMP:20210601T065945Z
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UID:21824-1623331800-1623335400@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:The next C3M seminar will be held on 10th June (1.30 pm) with a presentation from Michel Cloitre (Director of C3M Unit\, ESPCI Paris) resulting from his recent Weissenberg award 2021. \n \nPresentation title: Soft materials designer: where rheology meets chemistry and physics\n \nAbstract: Soft materials are all around us. They are present in personal and home care products\, food\, paints and in advanced formulations used for enhanced oil recovery\, solid ink printing and additive manufacturing. To develop soft materials with tailored properties\, formulators combine functional polymers\, colloids\, emulsions\, and amphiphilic molecules\, resulting in a great variability of composition\, microstructure\, and interactions. However\, in spite of this apparent diversity\, soft materials share in common the capacity to switch from solid-like behavior at rest to liquid-like under mechanical solicitation. A formidable challenge is to design yield stress glasses or gels with tailored rheology in a rational way. In this talk I will present our methodology which is based on two pillars. On one hand\, we use chemistry to fabricate polymer-colloid hybrids such as microgels\, capsules\, micelles\, star polymers\, with variable softness and tunable interactions\, leading to a wide range of viscoelastic moduli and time scales. On the other hand\, we exploit concepts from the physics of disordered out-of-equilibrium materials\, in particular jamming transition\, supercooled glasses\, dynamical heterogeneities\, and targeted particle scale simulations to bridge the gap between mesoscopic scale properties\, local dynamics and macroscopic rheology. This generic framework provides guidelines for designing and engineering yield stress materials with desired properties. \n \nHere is the zoom link for the seminar: https://espci.zoom.us/j/83559122094?pwd=OVBRbnpWdHZVL3JZQWxWTGlpYTVyUT09\n 
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-23/
LOCATION:Visioconférence
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20210610T140000
DTEND;TZID=Europe/Paris:20210610T150000
DTSTAMP:20210608T071934Z
CREATED:20210608T071934Z
LAST-MODIFIED:20210608T071934Z
UID:21845-1623333600-1623337200@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Landau Fermi liquids in disguise\n \nBy Michele Fabrizio\, SISSA Trieste\n\n\n\n \n\n\n\n\nZoom link: https://espci.zoom.us/j/87481437306?pwd=R0F5eTlQWHNtT3Q2cVZ6TEluNno2UT09\nID: 874 8143 7306\nPassword: LevLandau\nContact/to subscribe or unsubscribe: seminaires-lpem@espci.fr\n \n\n\n\n\n\n\n\nOrder by order in perturbation theory one can prove\, e.g.\, in 3D\, that the physical electron decay rate\, i.e.\, the imaginary part of self-energy\, vanishes quadratically at zero energy. Landau’s theory of Fermi liquids is conventionally derived assuming that such perturbative result continues to hold true beyond perturbation theory\, which is nothing but Landau’s assumption of adiabatic continuation. However\, that requires an interaction strength within the convergence radius of the perturbation series\, if the latter converges at all\, which may not be the case of strongly correlated metals\, especially close to a Mott transition. \nHowever\, it is evident that requiring an infinite lifetime of the physical electrons at zero energy is excessive for quasiparticles to exist. For that\, it would suffice requiring that the `quasiparticle` lifetime diverges\, irrespective of whether the physical electron lifetime does or not. \nHere\, we show that such simple\, yet physically sound\, change of perspective has huge implications\, Specifically\, by just assuming a quadratic vanishing of the quasiparticle decay rate at zero energy\, we can prove that well defined quasiparticles do exist close to a Luttinger surface\, manifold of k-points where the self-energy diverges at zero energy\, as well as to a conventional Fermi surface\, manifold of k-points where the Green’s function diverges at zero energy. That occurs despite the physical electron pseudo gap at a Luttinger surface. `Quasiparticles` at a Luttinger surface behave exactly like those at a Fermi surface\, e.g.\, they yield a linear in temperature specific heat\, again in spite of the vanishing density of states of physical electrons.   \nWe finally clarify the physical consequences of the above result in a model calculation based on a toy self-energy that uncovers an interesting interplay between Luttinger and Fermi surfaces.  
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-26/
LOCATION:Visioconférence
CATEGORIES:Séminaire
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