Transport performance of a dimer in inertial frictional ratchets  

作　　者：Li-Ming Fan Bao-quan Ai Jin-can Chen Tian-fu Gao Zhi-gang Zheng 

机构地区：[1]College of Physical Science and Technology,Shenyang Normal University,Shenyang 110034,China [2]Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006,China [3]Department of Physics,Xiamen University,Xiamen 361005,China [4]Institute of Systems Science(ISS),Huaqiao University,Xiamen 361021,China [5]College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China

出　　处：《Communications in Theoretical Physics》2024年第12期155-165,共11页理论物理通讯(英文版)

基　　金：partially supported by the National Natural Science Foundation of China(Grant No.12375031);the Basic Scientific Research Project of Colleges in Liaoning Province,China(Grant No.LJKMZ20221478);Shenyang Normal University Doctoral Program(Grant No.BS202214)。

摘　　要：This investigation focuses on the under-damped Brownian transport of a dimer characterized by two harmonically interacting components.The friction coefficients between the dimer components are different;thus the dynamic symmetry of the system is broken.In addition,the inertial ratchets are synchronously modulated by the feedback control protocol in time.Here,we analyze the transport performance by studying the average velocity and energy conversion efficiency of the dimer induced by friction symmetry breaking and external forces.Furthermore,we can also identify the enhancement of the centre-of-mass mean velocity and energy conversion efficiency of inertial frictional ratchets for intermediate values of the driving amplitude,coupling strength and damping force.Remarkably,in the weak bias case,the directed transport of inertial Brownian particles can be reversed twice by modulating the suitable friction of the dimer.In particular,the frictional ratchets can acquire a series of resonant steps under the influence of harmonic force.These conclusions of reliable transport in noisy environments are expected to provide insights into the performance of natural molecular motors.

关 键 词：frictional ratchets stochastic energetics theory transport performance energy conversion efficiency 

分 类 号：O41[理学—理论物理]