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Chin. Phys. B, 2011, Vol. 20(5): 050502    DOI: 10.1088/1674-1056/20/5/050502
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Entropic noise induced stability and double entropic stochastic resonance induced by correlated noises

Zeng Chun-Hua(曾春华)a)b)†, Wang Hua(王华) b), and Wang Hui-Tao(王辉涛)b)
a Faculty of Science, Kunming University of Science and Technology, Kunming 650093, China; b Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, China
Abstract  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) are 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 ($\lambda$>0), this maximum for MFPT shows the characteristic of the entropic noise induced stability (ENIS) effect. The intensity $\lambda$ 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 $\lambda$, i.e., the existence of a double-peak behaviour is the identifying characteristic of the double entropic stochastic resonance phenomenon.
Keywords:  correlated noises      confined system      entropic noise induced stability      double entropic stochastic resonance  
Received:  11 October 2010      Revised:  04 November 2010      Accepted manuscript online: 
PACS:  05.40.-a (Fluctuation phenomena, random processes, noise, and Brownian motion)  
  02.50.Ey (Stochastic processes)  
  05.10.Gg (Stochastic analysis methods)  
Fund: Project supported by Natural Science Foundation of Yunnan Province of China (Grant No. 2010CD031) and the National Natural Science Foundation of China (Grant Nos. 50906035, 90610035, 51066002, and U0937604).

Cite this article: 

Zeng Chun-Hua(曾春华), Wang Hua(王华), and Wang Hui-Tao(王辉涛) Entropic noise induced stability and double entropic stochastic resonance induced by correlated noises 2011 Chin. Phys. B 20 050502

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