Entropic noise induced stability and double entropic stochastic resonance induced by correlated noises  

作　　者：曾春华 王华 王辉涛 

机构地区：[1]Faculty of Science,Kunming University of Science and Technology [2]Center of Metallurgical Energy Conservation and Emission Reduction,Ministry of Education,Kunming University of Science and Technology

出　　处：《Chinese Physics B》2011年第5期146-152,共7页中国物理B（英文版）

基　　金：Project supported by Natural Science Foundation of Yunnan Province of China (Grant No. 2010CD031);the National Natural Science Foundation of China (Grant Nos. 50906035,90610035,51066002,and U0937604)

摘　　要：For the activated dynamics of a Brownian particle moving in a confined system with the presence of entropic barriers, this paper investigates a periodic driving and correlations between two noises. Within the two-state approximation, the explicit expressions of the mean first passage time （MFPT） and the spectral power amplification （SPA） axe obtained, respectively. Based on the numerical computations, it is found that： （i） The MFPT as a function of the noise intensity exhibits a maximum with the positive correlations between two noises （λ〉0）, this maximum for MFPT shows the characteristic of the entropic noise induced stability （ENIS） effect. The intensity A of correlations between two noises can enhance the ENIS effect. （ii） The SPA as a function of the noise intensity exhibits a double-peak by tuning the noise correlation intensity λ, i.e., the existence of a double-peak behaviour is the identifying characteristic of the double entropic stochastic resonance phenomenon.For the activated dynamics of a Brownian particle moving in a confined system with the presence of entropic barriers, this paper investigates a periodic driving and correlations between two noises. Within the two-state approximation, the explicit expressions of the mean first passage time （MFPT） and the spectral power amplification （SPA） axe obtained, respectively. Based on the numerical computations, it is found that： （i） The MFPT as a function of the noise intensity exhibits a maximum with the positive correlations between two noises （λ〉0）, this maximum for MFPT shows the characteristic of the entropic noise induced stability （ENIS） effect. The intensity A of correlations between two noises can enhance the ENIS effect. （ii） The SPA as a function of the noise intensity exhibits a double-peak by tuning the noise correlation intensity λ, i.e., the existence of a double-peak behaviour is the identifying characteristic of the double entropic stochastic resonance phenomenon.

关 键 词：correlated noises confined system entropic noise induced stability double entropic stochastic resonance ] 

分 类 号：O415[理学—理论物理]