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UID:0-856@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20221129T110000
DTEND;TZID=Europe/Paris:20221129T120000
DTSTAMP:20221116T101922Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-alexis-poncet-ens-lyon/
SUMMARY:Séminaire du LPTMS : Alexis Poncet (ENS Lyon) - Salle des séminai
 res du FAST et du LPTMS\, bâtiment Pascal n°530 - 29 Nov 22 11:00
DESCRIPTION:Collective effects in driven matter: from one-dimensional crowd
 ing to 2D melting\n Alexis Poncet (ENS Lyon)\n\n\nHybrid: onsite seminar +
  zoom.\nRegister in advance for this meeting:\nhttps://cnrs.zoom.us/meetin
 g/register/tJYtcuqvpjouGtOzHwyWErNx7GEQEv6xZV_4 \nAfter registering\, you 
 will receive a confirmation email containing information about joining the
  meeting.\n\n\n\nThe theoretical description of the structure and dynamics
  of matter far from thermal equilibrium is at the heart of modern statisti
 cal physics.\nIn this seminar\, I will focus on two prototypical exemples 
 of interacting agents driven out of equilibrium: driven hard-core particle
 s confined in 1D geometries\, and 2D colloidal crystals whose the elementa
 ry units are activated\, either by torques or forces. The first exemple wi
 ll be discussed from a fundamental perspective combining analytical theory
  and extensive numerical simulations\, the second exemple will be discusse
 d combing experiments\, simulations and theory.\n\nIn the first part of my
  talk I will address some fundamental questions about the response of non-
 equilibrium matter to point forces far beyond linear response theory. To t
 ackle this challenge\, I  will focus on the dynamic response of single-fil
 e systems locally driven by intruders.  While at high density intruders ca
 n only follow one another\, at low density they can unbind and separate. T
 o explain this unbinding transition [1]\, I will introduce a hydrodynamic 
 description of the density field. Strikingly\, such an approach can be ext
 ended to all orders of displacement-density correlations [2]\, proving a c
 omplete characterization of the one-tag process in single-file lattices cl
 osely related to their integrability.\n\nIn the second part of my talk\, I
  will describe two seemingly unrelated experiments  where spinning particl
 es [3] and confined emulsions form highly dynamical polycrystals kneaded b
 y the constant reconfigurations of grains boundaries. I will show that in 
 both cases the lively dynamics of the crystal originate from hydrodynamic 
 interactions that violate Newton's third law. I will investigate the impac
 t of non-reciprocity on stabilized crystalline phases [4]. In particular I
  will show that non-reciprocal interactions propel the topological defects
  of crystals thereby suppressing long-range order and giving rise to intri
 nsically dynamical polycrystalline phases.\n\n[1] Bénichou\, Démery & Po
 ncet\; Phys. Rev. Lett. 120\, 070601 (2018)\n[2] Poncet\, Grabsch\, Illien
  & Bénichou\; Phys. Rev. Lett. 127\, 220601 (2021)\n[3] Bililign\, Usabia
 ga\, Ganan\, Poncet\, Soni\, Magkiriadou\, Shelley\, Bartolo & Irvine\; Na
 t. Phys. 18\, 212–218 (2021)\n[4] Poncet & Bartolo\; Phys. Rev. Lett. 12
 8\, 048002 (2022) 
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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TZID:Europe/Paris
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DTSTART:20221030T020000
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