Enhancement of current commensurate with mutual noise-noise correlation in a symmetric periodic substrate: The benefits of noise and nonlinearity

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• 作者：Pradipta Ghosh^a ; Sudip Chattopadhyay^b ; ^{sudip_chattopadhyay@rediffmail.com} ; Jyotipratim Ray Chaudhuri^c ; ^{jprc_8@yahoo.com}
• 关键词：Langevin description ; Enhancement of current ; Noise-induced transport ; Mutual noise&ndash ; noise correlation ; Effective temperature
• 刊名：Chemical Physics
• 出版年：2012
• 期刊代码：18_03010104
• 类别：ch
• 出版时间：19 June, 2012
• 卷：402
• 期：Complete
• 页码：48-55
• 文件大小：420 K

摘要

Starting from a Langevin description of a particle submerged in a heat bath that offers a state dependent dissipation, we examine the noise-induced transport of a Brownian particle in the presence of two external, mutually correlated noises and envisage that in a symmetric periodic potential, the steady state current increases with an increase in the extent of correlation. The study of inhomogeneous diffusion in the presence of colored noise makes the present development formally interesting since this brings in a direct implication that exercising control on the degree of correlation can enhance the current in a properly designed experiment. As an offshoot of this development, we also envisage an effective temperature that depends on the correlation time and the extent of correlation.