Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session VV01: V: Poster Session III (7:00am-8:00am, PST)
7:00 AM,
Wednesday, March 22, 2023
Room: Virtual Room 1
Abstract: VV01.00008 : Role of noise on directed motion of active particles on Ratchet
Presenter:
Anshika Chugh
(Institute for Plasma Research)
Authors:
Anshika Chugh
(Institute for Plasma Research)
Rajaraman Ganesh
(Institute for Plasma Research)
A question that naturally arises is that, is direction motion in a collection of active particles is always guaranteed even in the absence of an unbiased external drive. Does the interplay between thermal fluctuations and active dynamics in a ratchet always assist directed motion or are there parameter zones where directed motion is suppressed? Our present work explores these questions by considering a system of underdamped active point particles on the ratchet. One of the interesting findings is that we discover a critical activity strength below which noise assists in generating directed motion whereas above a critical strength of activity directed motion is suppressed. It is also found that the peak in-directed motion shifts to lower activity strengths with an increase in background fluctuations or noise. Understanding this problem has several practical applications such as particle separation, and transport of ions through nano-pores, to name a few.
[1] P. Reimann, Brownian motors: noisy transport far from equilibrium, Physics Reports, 361 (2002) 57 – 265
[2] A. Chugh and R. Ganesh, Emergence of directed motion in a 2D system of Yukawa particles on 1D Ratchet, Physica A, 593 (2022) 126913
[3] S. De Karmakar, R. Ganesh, Phase transition and emergence of active temperature in an active Brownian system in underdamped background, Phys. Rev. E 101 (3) (2020) 032121
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