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arXiv 0806.4567cond-mat.stat-mech
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双谐波驱动非线性系统中的能量涨落

Energy fluctuations in a biharmonically driven nonlinear system

Institute of Physics(印度物理研究所)

Navinder Singh Bathinda, Sourabh Lahiri, A. M. Jayannavar

AI总结:

本研究针对双周期信号驱动的对称双势阱布朗粒子系统,分析其做功与热涨落特性,发现相位调制泵浦可增强以周期平均功衡量的随机共振,且系统满足稳态涨落定理。

摘要:

我们研究对称双势阱系统中布朗粒子的做功涨落与耗散热涨落。该系统由两个同时晃动势阱的周期输入信号驱动,通过调制驱动信号间的相对相位,可实现粒子在某一优先势阱中的束缚。我们表明,当存在泵浦时,若以每个周期对系统做的平均功来分析,随机共振信号会得到增强;这与通过施加外部静态偏置实现泵浦的情况相反,后者会削弱共振。我们分析了功与热涨落的性质,并证明稳态涨落定理在该系统中成立。

英文摘要:

We study the fluctuations of work done and dissipated heat of a Brownian particle in a symmetric double well system. The system is driven by two periodic input signals that rock the potential simultaneously. Confinement in one preferred well can be achieved by modulating the relative phase between the drives. We show that in the presence of pumping the stochastic resonance signal is enhanced when analyzed in terms of the average work done on the system per cycle. This is in contrast to the case when pumping is achieved by applying an external static bias, which degrades resonance. We analyze the nature of work and heat fluctuations and show that the steady state fluctuation theorem holds in this system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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