Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session L05: Active Matter in Complex Environments III
8:00 AM–10:48 AM,
Wednesday, March 17, 2021
Room: 05
Sponsoring
Units:
DSOFT DBIO GSNP DFD
Chair: Sujit Datta, Princeton University; Tapomoy Bhattacharjee, Princeton University
Abstract: L05.00014 : First passage of an active particle in the presence of passive crowders*
10:36 AM–10:48 AM
Live
Presenter:
Animesh Biswas
(Indian Institute of Technology Bombay)
Authors:
Animesh Biswas
(Indian Institute of Technology Bombay)
J. M. Cruz
(Indian Institute of Technology Bombay)
Punit Parmananda
(Indian Institute of Technology Bombay)
Dibyendu Das
(Indian Institute of Technology Bombay)
We experimentally study the stochastic transport of a self-propelled camphor boat, driven by Marangoni forces, through a crowd of passive paper discs floating on water. We analyze the statistics of the first passage times of the active particle to travel from the center of a circular container to its boundary. While the mean times rise monotonically as a function of the covered area fraction φ of the passive paper discs, their fluctuations show a non-monotonic behavior — being higher at low and high value of φ compared to intermediate values. The reason is traced to an interplay of two distinct sources of fluctuations — one intrinsic to the dynamics, while the other due to the crowding.
1.C. Tomlinson, Proceedings of the Royal Society of London, 1862,
575–577.
2. S. Redner, A guide to first-passage processes, Cambridge University
Press, 2001.
*The authors acknowledge financial support from IIT Bombay
and DST India (project’s reference no. EMR/2016/000275). We
also thank members of our Nonlinear Dynamics and Statistical
Physics Laboratory group for constructive discussions. D.D
would like to thank Amitabha Nandi and acknowledge SERB India(grant no. MTR/2019/000341) for financial support, and
J.M.C. acknowledges CONACYT (Repatriación 2019-1).
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