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UID:0-832@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20220712T110000
DTEND;TZID=Europe/Paris:20220712T120000
DTSTAMP:20220628T160612Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-thomas-franosch-innsbruck/
SUMMARY:Séminaire du LPTMS : Thomas Franosch  (University of Innsbruck) - 
 Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 12 J
 uil 22 11:00
DESCRIPTION:Gravitaxis of a single active particle\nThomas Franosch (Instit
 ut für Theoretische Physik - Universität Innsbruck)\nHybrid seminar: ons
 ite + zoom.\n\nhttps://cnrs.zoom.us/j/91436831925?pwd=MHpFTVlXWGU1d0N1VCtL
 cWsxRW92Zz09\nMeeting ID: 914 3683 1925\nPasscode: n5P5Ct\n\nThe active Br
 ownian particle (ABP) model has become a paradigm for dynamics far from eq
 uilibrium and has attracted considerable attention in the statistical-phys
 ics/soft-matter community [1\,2]. In this model particles undergo directed
  motion along their axis of orientation which is subject to orientational 
 diffusion. While it is rather easy to simulate the dynamics of such agents
  in a prescribed potential landscape\, analytical progress even for the si
 mplest set-ups has been difficult. Here I present an exact solution for th
 e dynamics of active Brownian particle in a uniform gravitational field as
  described by the equations of motion of Ref. [3]. We show that the proble
 m maps to the noisy overdamped pendulum or dynamics in a tilted washboard 
 potential. Close to the underlying classical bifurction we unravel a reson
 ance for the diffusion coefficient. We derive the corresponding Fokker-Pla
 nck equation and use techniques familiar from quantum mechanics to provide
  a complete solution. The scaling behavior at the resonance is rationalize
 d in terms of a simple harmonic oscillator picture.\n\n[1] Clemens Beching
 er\, Roberto Di Leonardo\, Hartmut Löwen\, Charles Reichhardt\, Giorgio V
 olpe\, and Giovanni Volpe\, Active particles in complex and crowded enviro
 nments\, Rev. Mod. Phys. 88\, 045006 (2016).\n\n[2] C. Kurzthaler\, C. Dev
 ailly\, J. Arlt\, T. Franosch\, W. C. K. Poon\, V. A. Martinez\, and A. T.
  Brown\, Probing\nthe spatiotemporal dynamics of catalytic janus particles
  with single-particle tracking and differential dynamic microscopy\, Physi
 cal Review Letters 121\, 078001 (2018).\n\n[3] B. ten Hagen\, F. Kümmel\,
  R. Wittkowski\, D. Takagi\, H. Löwen\, and C. Bechinger\, Gravitaxis of 
 asymmetric\nself-propelled colloidal particles\, Nature Communications 5\,
  4829 (2014).
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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