We study the motion of an inertial microswimmer in a non-Newtonian environment with a finite memory and present the theoretical realization of an unexpected transition from random self-propulsion to rotational(circula...We study the motion of an inertial microswimmer in a non-Newtonian environment with a finite memory and present the theoretical realization of an unexpected transition from random self-propulsion to rotational(circular or elliptical)motion.Further,the rotational motion of the swimmer is followed by spontaneous local directional reversal,yet with a steady-state angular diffusion.Moreover,the advent of this behaviour is observed in the oscillatory regime of the inertia-memory parameter space of the dynamics.We quantify this unconventional rotational motion of the microswimmer by measuring the time evolution of the direction of its instantaneous velocity or orientation.By solving the generalized Langevin model of non-Markovian dynamics of an inertial active Ornstein–Uhlenbeck particle,we show that the emergence of the rotational(circular or elliptical)trajectory is due to the presence of both inertial motion and memory in the environment.展开更多
基金the 8th Statphysics Community Meeting(ICTS/ISPCM2023/02)during which we had lots of fruitful discussionsMS acknowledges the start-up grant from UGC,SERB-SURE grant(SUR/2022/000377),CRG grant(CRG/2023/002026)from DST,Govt.of India for the financial support。
文摘We study the motion of an inertial microswimmer in a non-Newtonian environment with a finite memory and present the theoretical realization of an unexpected transition from random self-propulsion to rotational(circular or elliptical)motion.Further,the rotational motion of the swimmer is followed by spontaneous local directional reversal,yet with a steady-state angular diffusion.Moreover,the advent of this behaviour is observed in the oscillatory regime of the inertia-memory parameter space of the dynamics.We quantify this unconventional rotational motion of the microswimmer by measuring the time evolution of the direction of its instantaneous velocity or orientation.By solving the generalized Langevin model of non-Markovian dynamics of an inertial active Ornstein–Uhlenbeck particle,we show that the emergence of the rotational(circular or elliptical)trajectory is due to the presence of both inertial motion and memory in the environment.
