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Abstract: Based on a microscopic system reservoir model,where the associated bath isnot in thermal equilibrium, we simulate the nonstationary Langevin dynamics andobtained the generalized nonstationary fluctuation dissipation relation FDRwhich asymptotically reduces to the traditional form. Our Langevin dynamicsincorporates non-Markovian process also, the origin of which lies on thedecaying term of the nonstationary FDR. We then follow the stochastic dynamicsof the Langevin particle based on the Fokker-Planck-Smoluchowski description,in ratchet potential to obtain the steady and time dependent current in ananalytic form. We also examine the influence of initial excitation andsubsequent relaxation of bath modes on the transport of the Langevin particleto show that the nonequilibrium nature of the bath leads to both strongnon-exponential dynamics as well as nonstationary current.



Autor: Satyabrata Bhattacharya, Suman Kumar Banik, Sudip Chattopadhyay, Jyotipratim Ray Chaudhuri

Fuente: https://arxiv.org/







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